what is the first transition state an existing instance…

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