You want to configure Concurrent SRDF/Star using Enginuity 5874 and Solutions Enabler 7.x. The workload site will be at Site A, the synchronous target will be at Site B, and the asynchronous target will be at Site C.
Which type of RDF devices will be needed at each site?

A.
R11 at Site A, R21 at Site B, and R22 at Site C

B.
R1 at Site A, R21 at Site B, and R2 at Site C

C.
R11 at Site A, R22 at Site B, and R21 at Site C

D.
R11 at Site A, R22 at Site B, and R22 at Site C