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 runs On 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.