A Symmetrix has 20 R1 volumes in 2 RDF groups with 10 volumes in each running in SRDF/A mode. What is an appropriate grouping to manage these devices?

A.
Create 10 device groups with 2 devices in each group

B.
Create 1 device group with all 20 devices

C.
Create 2 device groups with all 10 devices from each RDF group in the same device group

D.
Create up to 20 groups with 1 device in each group