Which devices must support Multi-User Multiple Input Multiple Output (ML) MIMO) in order for an AP to transmit to multiple clients simultaneously?

Which devices must support Multi-User Multiple Input Multiple Output (ML) MIMO) in order for an AP to transmit to multiple clients simultaneously?
A . all of the APs in a WLAN, but none of the clients
B . the transmitting AP and at least one of the clients that receives simultaneous transmissions
C . the transmitting AP and all of the clients
D . the transmitting AP and all of the clients that receive simultaneous transmissions

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Answer: A