(From the box,"Controlling 802.11 Transmission")When a wireless NIC receives a frame correctly,it immediately sends back a reply without listening for traffic.

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When a wireless NIC receives a frame correctly, it sends back an acknowledgement (ACK) frame to the sender to inform that the frame was received successfully. The NIC does not need to listen for traffic before sending back the ACK frame. Thus, the statement is true.

(From the Box,"Controlling 802