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4. Five wireless stations are connected in a chain topology as shown below. Each station is able to hear the next and the previous neighbor in the chain. They are using 802.11 DCF basic access mode (CSMA/CA without using RTS/CTS) for exchanging data. ? 3 5 . (a) Station 1 is sending to station 2 already. Station 3 wants to address station 4. Is 3 allowed to send a packet and will it do so? Will collision occur? (b) Station 3 sends to station 2, and station would like to send a packet to station 4. Will station 5 start sending and should it? (C) Station 1 and 2 are sending. Which stations belief that they can send and which ones are actually allowed to do so? (d) Station 1 and 4 are sending. Which stations belief that they can send and which ones are actually allowed to do so