In this scenario, what are two methods to receive the active source information on R2?

Referring to the exhibit, anycast RP is implemented to ensure multicast service availability.

The source is currently sending multicast traffic using group 239.1.1.1 and R3 is receiving PIM register messages, but R2 does not have active source information.

In this scenario, what are two methods to receive the active source information on R2? (Choose two.)
A . Configure an RP set in PIM on R1, allowing R1 to forward PIM register messages to R2 and R3 in the set.
B. Configure an MSDP protocol between R2 and R3.
C. Configure an RP set in PIM on R2 and R3, allowing the RPs to forward PIM register messages to the other RPs in the set.
D. Configure an MSDP protocol between R1 and R2.

Answer: A,C