Refer to the exhibit.
Every switch shown in the exhibit is an AOS-Switch that runs PIM-SM. A network administrator wants to load-balance the RP role, so Switch-3 and Switch-4 both act as RPs for some of the multicast groups. How should the administrator configure the RPs?
In PIM-SM (Protocol Independent Multicast - Sparse Mode), to load-balance the RP role among more than one switch, you need to specify multiple candidate RPs, and this information needs to be propagated by a Bootstrap Router (BSR). Switch-1 and Switch-2 are C-BSRs (Candidate Bootstrap Routers), which means they can announce the RP set to the entire PIM domain. To achieve load balancing, you should specify Switch-3 and Switch-4 as candidate RPs on both Switch-1 and Switch-2, so that this information can be propagated to all switches, allowing them to choose dynamically between Switch-3 and Switch-4 for different multicast groups. Therefore, the correct approach is to configure Switch-3 and Switch-4 IP addresses as candidate RP addresses on Switch-1 and Switch-2.
C is the answer. It's about Bootstrap and Load balancing (p. 151 in guide)
C is correct. You can use groups to LB amongst the C-RPs/