A User Is Running a Batch Process on EBS Backed

Multiple Choice

A user is running a batch process on EBS backed EC2 instances. The batch process starts a few instances to process hadoop Map reduce jobs which can run between 50 - 600 minutes or sometimes for more time. The user wants to configure that the instance gets terminated only when the process is completed. How can the user configure this with CloudWatch?

A) Setup the CloudWatch action to terminate the instance when the CPU utilization is less than 5%
B) Setup the CloudWatch with Auto Scaling to terminate all the instances
C) Setup a job which terminates all instances after 600 minutes
D) It is not possible to terminate instances automatically