A user has enabled detailed CloudWatch metric monitoring on an Auto Scaling group. Which of the below
mentioned metrics will help the user identify the total number of instances in an Auto Scaling group including
pending, terminating and running instances?

A.
GroupTotalInstances

B.
GroupSumInstances

C.
It is not possible to get a count of all the three metrics together. The user has to find the individual number
of running, terminating and pending instances and sum it

D.
GroupInstancesCount

Explanation:
CloudWatch is used to monitor AWS as well as the custom services. For Auto Scaling, CloudWatch provides
various metrics to get the group information, such as the Number of Pending, Running or Terminating
instances at any moment. If the user wants to get the total number of Running, Pending and Terminating
instances at any moment, he can use the GroupTotalInstances metric.