In an 802.11 network, station A sends one data frame (not fragmented) to station B. What would be the value of the D field (in microseconds) that needs to be set for the NAV period in each of the following frames: RTS, CTS, data, and ACK? Assume that the transmission time for RTS, CTS, and ACK is 4 μs each. The transmission time for the data frame is 40 μs and the SIFS duration is set to 1 μs. Ignore the propagation time. Note that each frame needs to set the duration of NAV for the rest of the time the medium needs to be reserved to complete the transaction.