What prevents this implementation from being successful?

A customer has an Oracle 11g database running on a RAC cluster with ASM. It occupies approximately 5 TB on a Symmetrix DMX. They have an RTO of four hours. They intend to implement PowerSnap with EMC NetWorker version 7.6 to back up the BCVs using RMAN scripts and a proxy host.

What prevents this implementation from being successful?
A . PowerSnap is not supported on Oracle 11g with EMC NetWorker 7.6.
B . BCVs cannot be mounted to a proxy host with a RAC cluster.
C . RTO of four hours cannot be accomplished.
D . ASM does not support proxy hosts.

Answer: D