A. Create an IAM role that includes the CloudWatchAgentServerPolicy AWS managed policy. Attach the role to the instances.
B. Create an IAM role that includes the CloudWatchApplicationInsightsReadOnlyAccess AWS managed policy. Attach the role to the instances.
C. Install and start the CloudWatch agent by using AWS Systems Manager or the command line.
D. Install and start the CloudWatch agent by using an IAM role. Attach the CloudWatchAgentServerPolicy AWS managed policy to the role.
E. Configure a CloudWatch alarm to enter ALARM state when the disk_used_percent CloudWatch metric is greater than 80%.
F. Configure a CloudWatch alarm to enter ALARM state when the disk_used CloudWatch metric is greater than 80% or when the disk_free CloudWatch metric is less than 20%.

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