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Q18 Single choice

A company migrated its antivirus solution for 10,000 Amazon EC2 instances to a new software as a service SaaS solution. Fewer than 5% of instances reported in the new SaaS agent. The company suspects that either the new agent failed to load or the new agent's configuration was altered. The company needs to implement a solution to ensure that all instances consistently run the most recent agent version with a predefined configuration.

Which solution will meet these requirements with the LEAST administrative overhead?

A
Create an AWS Lambda function that is invoked on a schedule. Store a machine list in Amazon S3. Configure the Lambda function to log in to every machine, download and install the most recent version of the agent, and configure the agent.
B
Implement an AWS Config rule with auto remediation that uses AWS Lambda for noncompliant events. Develop a Lambda function to access machines and download and install the most recent agent version. Schedule the Lambda function to invoke daily.
C
Create an AWS Systems Manager document that defines the agent installation and configuration process. Configure AWS Systems Manager State Manager to associate the document with EC2 instances. Apply the desired state on a daily schedule.
D
Log in to EC2 instances by using AWS Systems Manager Session Manager. Update the EC2 user data script to download and install the most recent agent and configure the agent. Reboot all EC2 instances to ensure that the script applies successfully.

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