Does the Interface Whose Address Is Used as the BSR

Does the interface whose address is used as the BSR candidate require PIM enablement?

A) Yes, that interface must be PIM-enabled.
B) No, it is unnecessary to enable PIM on that interface.
C) If it is a physical interface, that interface should be PIM-enabled, otherwise it is unnecessary.
D) If the RPF check is using the multicast routing table, that interface should be PIM-enabled, otherwise it is unnecessary.