Which multicast protocol satisfies these requirements?

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An engineer must design a multicast network for a financial application. Most of the multicast sources also receive multicast traffic (many-to-many deployment model). To better scale routing tables, the design must not use source trees.

Which multicast protocol satisfies these requirements?
A . PIM-SSM
B . PIM-SM
C . MSDP
D . BIDIR-PIM

Answer: D