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How can a user track memory usage in an EC2 instance?

• A. Call Amazon CloudWatch to retrieve the memory usage metric data that exists for the EC2 instance.

• B. Assign an IAM role to the EC2 instance with an IAM policy granting access to the desired metric.

• C. Use an instance type that supports memory usage reporting to a metric by default.

• D. Place an agent on the EC2 instance to push memory usage to an Amazon CloudWatch custom metric.

https://www.quora.com/How-can-I-monitor-memory-usage-on-Amazon-EC2