Which of the following requires a custom CloudWatch metric to monitor?
A.
Memory Utilization of an EC2 instance
B.
CPU Utilization of an EC2 instance
C.
Disk usage activity of an EC2 instance
D.
Data transfer of an EC2 instance
Explanation:
http://arr.gr/blog/2013/08/monitoring-ec2-instance-memory-usage-with-cloudwatch/