the correct answer is A. bidirectional.
Bidirectional PIM exclusively uses the shared tree for all multicast communication, unlike Sparse Mode, which can switch between shared and source-specific trees.
It's option C, because The PIM (Protocol Independent Multicast) mode that uses a shared tree only is "dense" mode. In PIM Dense Mode (PIM-DM), multicast traffic is initially flooded across the entire network, and routers prune back branches of the tree where no receivers are present. It's suitable for smaller networks or scenarios where multicast traffic is spread to most of the network.
In bidirectional mode, traffic is routed only along a bidirectional shared tree that is rooted at the rendezvous point (RP) for the group
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16/imc-pim-xe-16-book/imc-tech-oview.html#GUID-51D0D6DF-E7F1-4A0E-8E31-D7ED464DF2AC
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A (35%)
C (25%)
B (20%)
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