The following description of the BSR mechanism, which is correct? (Multiple Choice)

The following description of the BSR mechanism, which is correct? (Multiple Choice)
A . There can be multiple C-BSR in a PIM-SM domain, but only one BSR can be elected.
B . The BSR collects C-RP information through the received C-RP data packets.
C . The BSR advertises BSR information and C-RP information to all routers in the PIM-SM domain by flooding Bootstrap packets.
D . One C-BSR can also collect C-RP information through received C-RP packets.

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Answer: ABC