How can database homes be pooled together into Database as a Service (DBaaS) pools by using the Enterprise Manager Cloud Control 12c self-service provisioning portal?

How can database homes be pooled together into Database as a Service (DBaaS) pools by
using the Enterprise Manager Cloud Control 12c self-service provisioning portal?

A.
They may be pooled together by major and maintenance release only if they are on the
same operating system platform.

B.
They may be pooled together by major, maintenance, Fusion Middleware, and
componentspecific release if they are on different operating system platforms.

C.
Single-instance database homes of the same major, maintenance, Fusion Middleware,
and component-specific release may be pooled together if they are on the same operating
system platform.

D.
RAC database homes of the same major, maintenance, and component-specific release
may be pooled together if they are on the same operating system platform.