Refer to the exhibit. 
What is the meaning of the asterisk (*) in the output?
A.
PIM neighbor 10.1.5.6 is the RPF neighbor for the group 232.1.1.1 for the shared tree.
B.
PIM neighbor 10.1.5.6 is the one that is seen as the RPF neighbor when performing the
command show ip rpf 10.1.4.7.
C.
PIM neighbor 10.1.5.6 is the winner of an assert mechanism.
D.
The RPF neighbor 10.1.5.6 is invalid.