For AWS Auto Scaling, what is the first transition state an existing instance enters after leaving steady state in Standby
mode?

A.
Detaching

B.
Terminating:Wait

C.
Pending

D.
EnteringStandby

Explanation:
You can put any instance that is in an InService state into a Standby state. This enables you to remove the instance from
service, troubleshoot or make changes to it, and then put it back into service. Instances in a Standby state continue to be
managed by the Auto Scaling group. However, they are not an active part of your application until you put them back into
service.
http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/AutoScalingGroupLifecycle.html