The interfaces' IGP metric is as shown and PIM is using unicast table for RPF-check. What will happen when Router B receives the register message on its interface facing Router A?
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A. Discard the register message as RPF-check fails
B. Forward the register message to Router D (RP) according to its routing table
C. Forward the register message out of all the interfaces in its (", 239.1.1.1) entry's outgoing interface list
D. Forward the register message out of all the interfaces in its (192.168.1.1, 239.1.1.1) entry's outgoing interface list
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