With regard to OLT+MDU networking and OLT+ONT networking, what are the correct statements about multicast configuration?

With regard to OLT+MDU networking and OLT+ONT networking, what are the correct statements about multicast configuration?
A . The configuration of the two on the OLT is the same.
B . When the unicast VLAN and the multicast VLAN are different, the configurations on the OLT are the same.
C . When the unicast VLAN and the multicast VLAN are different, in the OLT+MDU networking, a separate gemport-maping and service-port for the multicast VLAN on the MDU is added to the OL
E . None of the above

Answer: C