You have a set of EC2 Instances in an Autoscaling Group that processes messages from an SQS queue. The messages contain the location in S3 from where video`s need to be processed by the EC2 Instances. When a scale in happens, it is noticed that an at times that the EC2 Instance is still in a state of processing a video when the instance is terminated. How can you implement a solution which will ensure this does not happen?

Answer options:

A.Change the CoolDown property for the Autoscaling Group.
B.Suspend the AZRebalance termination policy
C.Use lifecycle hooks to ensure the processing is complete before the termination occurs
D.Increase the minimum and maximum size for the Auto Scaling group, and change the scaling policies so they scale less dynamically.

Answer - C
This is a case where lifecycle policies can be used. The lifecycle policy can be used to put the instance in a state of Terminating:Wait , complete the processing and then send a signal to complete the termination
Auto Scaling lifecycle hooks enable you to perform custom actions by pausing instances as Auto Scaling launches or terminates them. For example, while your newly launched instance is paused, you could install or configure software on it.
For more information on Autoscaling lifecycle hooks , please visit the below URL:
http://docs.aws.amazon.com/autoscaling/latest/userguide/lifecycle-hooks.html