Refer to the exhibit.

A company has a functional multicast routing solution, which routes multicasts from the data
center users in VLAN3 and VLAN4. Users in VLAN 3 and VLAN 4 sometimes register for some of
the same multicast. The network administrator wants to prevent duplicate multicasts on the link
between the core IRF virtual switch and the access layer IRF virtual switches.
What should the administrator do to accomplish this goal?

A.
Enable IGMP snooping on VLAN 3 and VLAN4 (Layer 2) on the core switch and on the access
layer switches.

B.
Create Layer 3 interfaces for VLAN 3 and VLAN 4 on the access layer switches, and enable
IGMP on the interfaces.

C.
Enable Multicast VLAN and IGMP snooping on VLAN 3 on the access layer switches, and
associate VLAN 4 as a sub-VLAN.

D.
Create Layer 3 interfaces for VLAN 3 and VLAN 4 on the access layer switches, and enable
PIM on the interfaces.

Explanation: