Refer to the exhibit.

A Symmetrix is configured with two RDF groups, RDFG 1 and RDFG 2, as shown. The SRDF R1 devices used by Application 1 (App 1) are in RDFG 1. The SRDF R1 devices used by Application 2 (App 2) are in RDFG 2.
What should be created to allow independent management of SRDF/A sessions for App 1 and App 2?

A.
One composite group with all the devices in RDFG 1 and RDFG 2

B.
Two device groups, one with the App 1 devices and another with the App 2 devices

C.
One device group with all the devices in RDFG 1 and RDFG 2

D.
One file with the App 1 and the App 2 devices