When does an AWS Data Pipeline terminate the AWS Data Pipeline-managed compute
resources?

A.
AWS Data Pipeline terminates AWS Data Pipeline-managed compute resources every 2 hours.

B.
When the final activity that uses the resources is running

C.
AWS Data Pipeline terminates AWS Data Pipeline-managed compute resources every 12 hours.

D.
When the final activity that uses the resources has completed successfully or failed

Explanation:
Compute resources will be provisioned by AWS Data Pipeline when the first activity for a
scheduled time that uses those resources is ready to run, and those instances will be terminated
when the final activity that uses the resources has completed successfully or failed.
https://aws.amazon.com/datapipeline/faqs/