Which two strings that could be dialed to start a multipoint conference that is hosted by the multipoint control unit?

Refer to the exhibit.

Which two strings that could be dialed to start a multipoint conference that is hosted by the multipoint control unit? (Choose two.)
A . 52900121
B . [email protected]
C . [email protected]
D . 5919
E . ex90
F . [email protected]

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Answer: D, F