When an ACK frame is not received by the transmitting STA, what is assumed?

When an ACK frame is not received by the transmitting STA, what is assumed?
A . The frame was correctly delivered
B . The frame was not delivered and must be retransmitted
C . The receiver is offline
D . The receiver processed the frame, but did not respond with an ACK frame because 802.11w is enabled

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Answer: B