How can multiple compute resources be used on the same pipeline in AWS Data Pipeline?

A.
You can use multiple compute resources on the same pipeline by defining multiple cluster objects
in your definition file and associating the cluster to use for each activity via its runsOn field.

B.
You can use multiple compute resources on the same pipeline by defining multiple cluster
definition files.

C.
You can use multiple compute resources on the same pipeline by defining multiple clusters for
your activity.

D.
You cannot use multiple compute resources on the same pipeline.

Explanation:
Multiple compute resources can be used on the same pipeline in AWS Data Pipeline by defining
multiple cluster objects in your definition file and associating the cluster to use for each activity via
its runsOn field, which allows pipelines to combine AWS and on-premise resources, or to use a
mix of instance types for their activities.
https://aws.amazon.com/datapipeline/faqs/