Refer to the exhibit.

IRF 1, at the campus core campus core, enables Internet Group Management Protocol (IGMP) on its VLAN3 interface. IRF 1 is also part of a multicast routing solution with the data center infrastructure devices. How can a network administrator ensure that only endpoints that have registered for multicasts destined to 239.1.1.1 receive these multicasts?
Correct Answer: C
Explanation/Reference:
IGMP snooping enables Layer 2 switches to establish a Layer 2 multicast forwarding table instead of flooding all multicast packets. To populate the Layer 2 multicast forwarding table, IGMP snooping listens to IGMP messages exchanged between a Layer 3 multicast device and hosts.
Reference: 07-IP Multicast Configuration Guide, 02-IGMP snooping configuration
http://www.h3c.com/portal/Technical_Support___Documents/Technical_Documents/Switches/ H3C_S12500_Series_Switches/Configuration/Operation_Manual/H3C_S12500_CG-Release7128-
6W710/07/201301/772657_1285_0.htm