How do the routers in the PIM domain become aware of the address of the elected BSR?

How do the routers in the PIM domain become aware of the address of the elected BSR?
A .  It is unicast to them
B .  It is flooded through the network in a bootstrap message
C .  It is preconfigured on all routers
D .  It is flooded through the network in the PIM Hello

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Answer: B