What is the order execution?

An organization has configured Auto Scaling for hosting their application. The system admin wants
to
understand the Auto Scaling health check process. If the instance is unhealthy, Auto Scaling
launches an
instance and terminates the unhealthy instance. What is the order execution?

A.
Auto Scaling launches a new instance first and then terminates the unhealthy instance

B.
Auto Scaling performs the launch and terminate processes in a random order

C.
Auto Scaling launches and terminates the instances simultaneously

D.
Auto Scaling terminates the instance first and then launches a new instance

Explanation:
Auto Scaling keeps checking the health of the instances at regular intervals and marks the
instance for
replacement when it is unhealthy. The ReplaceUnhealthy process terminates instances which are
marked as unhealthy and subsequently creates new instances to replace them. This process first
terminates the instance and then launches a new instance.