Which multicast rendezvous point redundancy mode is valid for Bidirectional PIM?

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1. correct answer is B “Redundant Phantom Rendezvous Point”

   “Rendezvous Point Redundancy
   While work on a general and simple mechanism for providing rendezvous point redundancy in Bidir
   is finalized, some topology dependent mechanisms are currently available. Because multicast
   source information is no longer available in Bidir, the Anycast/MSDP mechanism used to provide
   redundancy in sparse-mode is not an option for Bidir. That mechanism relied on the announcement
   of active sources through MSDP, which is not available in Bidir. Following is a set of solutions for
   providing rendezvous point redundancy for Bidir with our existing implementation. Keep in mind
   that the redundancy paradigm is different than that for sparse-mode. In Bidir, redundancy consists
   of a primary/ secondary model, there is no load sharing as was possible with the Anycastrendezvous point sparse-mode case (it’s impossible to load share without maintaining source
   information).”

   https://www.cisco.com/c/dam/en/us/products/collateral/ios-nx-os-software/multicast-enterprise/prod_white_paper0900aecd80310db2.pdf

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