Click on the exhibit below.

If the SDP between R2 and R1 goes down, what devices will be reachable from R2 through the VPLS?

A. Only R4 will be reachable through the VPLS.

B. All devices will be reachable through the VPLS.
C. R4 and R3 will remain reachable.
D. No devices will be reachable.