If there are multiple set-top boxes under one ONT watching a multicast program at the same time, which of the following functions can be enabled on the OLT for the ONT multicast user to ensure that when one set-top box switches channels, the programs watched by other set-top boxes will not Affected

If there are multiple set-top boxes under one ONT watching a multicast program at the same time, which of the following functions can be enabled on the OLT for the ONT multicast user to ensure that when one set-top box switches channels, the programs watched by other set-top boxes will not Affected
A . MAC-based quick leave
B. immediate departure
C. preview
D. prejoin

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Answer: A