Which multicast routing protocol is most optimal for supporting many-to-many multicast applications?

Which multicast routing protocol is most optimal for supporting many-to-many multicast
applications?

A.
PIM-SM

B.
PIM-BIDIR

C.
MP-BGP

D.
DVMRP

E.
MSDP

Explanation:
PIM-Bidirectional Operations

PIM Bidirectional (BIDIR) has one shared tree from sources to RP and from RP to receivers.
This is unlike the PIM-SM, which is unidirectional by nature with multiple source trees – one
per (S, G) or a shared tree from receiver to RP and multiple SG trees from RP to sources.
Benefits of PIM BIDIR are as follows:
• As many sources for the same group use one and only state (*, G), only minimal states are
required in each router.
• No data triggered events.
• Rendezvous Point (RP) router not required. The RP address only needs to be a routable
address and need not exist on a physical device.