SELinux must run in force mode.

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What must be the first line of a plain text user-data configuration containing YAML configuration for cloud-init?

• A.cloud-config:
• B.--- cloud-config
• C.#!/usr/bin/cloud-init
• D.[cloud-config]
• E.#cloud-config

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SIMULATION
Configure iptables, there are two domains in the network, the address of local domain is 172.24.0.0/16 other domain is 172.25.0.0/16, now refuse domain 172.25.0.0/16 to access the server.

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SELinux must be running in the Enforcing mode.

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Configure Cron Job
Configure a cron job to automatically execute /usr/bin/echo hello every day at 14:23 for the user harry.

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