About multimedia conference configuration, which of the following statement is correct? (Multiple Choice)

About multimedia conference configuration, which of the following statement is correct? (Multiple Choice)
A . Huawei multimedia conference core components include Multimedia conferencing servers MS, Unified Gateway and BMU, indispensable.
B . Do not need to configure the Multimedia conferencing servers MS information on the BMU
C . Must configure in unified gateway side to the Meeting MS’ SIP trunk
D . UC number using multimedia conference need to open "instant meeting business" permission

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Answer: ACD