A Company Wants to Use SSM as the Multicast Routing

Multiple Choice

A company wants to use SSM as the multicast routing protocol inside its network. Some of its multicast applications do not support IGMPv3. In which two ways can the mapping be done when these applications send IGMPv2 join messages? (Choose two.)

A) The Layer 2 switches can send a request to a DNS server.
B) The Layer 3 multicast routers can send a request to a DNS server.
C) The mapping can be done statically at the Layer 2 switches.
D) The mapping can be done statically at the Layer 3 multicast routers.
E) The Layer 2 switches can transform the IGMPv2 join to an IGMPv3lite join.
F) The Layer 3 multicast routers can transform the IGMPv2 join to an IGMPv3lite join.