Refer to the following exhibit.
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?
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
Answer: B