Part A: There are two different friends who want to send some informative data to each other. A friend Abdul Hadi first sends the data and check whether other friend, Abdul Basit is available or not. The communication process is, Abdul Hadi has to check the availability of Abdul Basit. Abdul Hadi has sent three different information’s (frame 1 to 3), to Abdul Basit after positive response each time. After all the successful communication, the session has been terminated by Abdul Hadi. In your opinion, which one will be better choice from ENQ/ACK and Poll/Select? Draw the proper diagram of above scenario to support your answer. Part B: Refer to above scenario, also draw the diagram for Stop and Wait method in Flow Control. Part C: Refer to above scenario of Part A; if the acknowledgement has been lost of data 2 during transmission and Abdul Hadi could not receive this then what will happen? Draw the appropriate diagram for Sliding Window ARQ by using Go-Back-n method

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