Which of the following requires a custom CloudWatch met…

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:
CloudWatch relies on the information provided by this hypervisor, which can only see the most hardware-sided
part of the instance’s status, including CPU usage (but not load), total memory size (but not memory usage),
number of I/O operations on the hard disks (but not it’s partition layout and space usage) and network traffic
(but not the processes generating it).