Click the Exhibit

Click the exhibit. The interface's IGP metric is as shown, and PIM is using the unicast table for the RPF-check. What happens when Router B receives a register message on its interface facing Router A?

A) Router B discards the register message, as the RPF-check fails.
B) Router B forwards the register message to Router D (RP) according to its routing table.
C) Router B forwards the register message out of all the interfaces in its (',239.1.1.1) entry's outgoing interface list.
D) Router B forwards the register message out of all the interfaces in its (192.168.1.1,239.1.1.1) entry's outgoing interface list.