A developer is working on an application that is deployed on an Amazon EC2 instance. The application needs to transfer a file to an Amazon S3 bucket. What should the developer do to authenticate the application's access to the S3 bucket in the MOST secure way?

• A.Configure a bucket policy for the S3 bucket. Allow access from the EC2 instance ID in the bucket policy.
• B.Create an access key for an IAM user. Store the access key in the application's environment variables.
• C.Create an IAM role. Create an access key for the role. Store the access key in the application's environment variables.
• D.Associate an IAM role with the EC2 instance. Use the instance metadata service to retrieve the credentials.

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Queries to an Amazon DynamoDB table are consuming a large amount of read capacity. The table has a significant number of large attributes. The application does not need all of the attribute data.
How can DynamoDB costs be minimized while maximizing application performance?

• A.Batch all the writes, and perform the write operations when no or few reads are being performed.
• B.Create a global secondary index with a minimum set of projected attributes.
• C.Implement exponential backoffs in the application.
• D.Load balance the reads to the table using an Application Load Balancer.

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A developer is building a web and mobile application for two types of users regular users and guest users Regular users are required to log in, but guest users do not log in Users should see only their data regardless of whether they authenticate Users need AWS credentials before they can access AWS resources What is the MOST secure solution that the developer can implement to allow access for guest users?

• A.Use an Amazon Cognito credentials provider to issue temporary credentials that are linked to an unauthenticated role that has access to the required resources.
• B.Set up an IAM user that has permissions to the required resources. Hardcode the 1AM credentials in the web and mobile application
• C.Generate temporary credentials. Store the temporary credentials in AWS Secrets Manager Use the temporary credentials to access the required resources
• D.Generate temporary keys that are stored in AWS Key Management Service (AWS KMS) Use the temporary keys to access the required resources

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A development team uses AWS Elastic Beanstalk for application deployment. The team has configured the application version lifecycle policy to limit the number of application versions to 25 However even with the lifecycle policy the source bundle is deleted from the Amazon S3 source bucket What should a developer do in the Elastic Beanstalk application version lifecycle settings to retain the source code in the S3 bucket?

• A.Set Retention to Retain source bundle in S3.
• B.Change the Set the application version limit by age setting to zero.
• C.Disable the Lifecycle policy setting
• D.Change the Set the application versions limit by total count setting to zero.

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A company is building an application to track athlete performance using an Amazon DynamoDB table. Each item in the table is identified by a partition key (user_id) and a sort key (sport_name). The table design is shown below:

(Note: Not all table attributes are shown)
A Developer is asked to write a leaderboard application to display the top performers (user_id) based on the score for each sport_name.
What process will allow the Developer to extract results MOST efficiently from the DynamoDB table?

• A.Use a DynamoDB query operation with the key attributes of user_id and sport_name and order the results based on the score attribute.
• B.Create a global secondary index with a partition key of sport_name and a sort key of score, and get the results
• C.Use a DynamoDB scan operation to retrieve scores and user_id based on sport_name, and order the results based on the score attribute.
• D.Create a local secondary index with a primary key of sport_name and a sort key of score and get the results based on the score attribute.

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