Let us assume that there are two stations X and Y. Here Station X is Sender and Y is receiver. Both the stations are using Go-Back-N ARQ method with 3-bit sequence number and senders window size of 4. Plot the diagram to show the position of senders window for the following succession of events: (i) At the beginning, before station X sends any frame. (ii) After station X sends frame 0, 1, 2 and 3 and receives acknowledgement from B for 0 and 1. (iii) After station X sends frames 4 and 5 and receives acknowledgement for frame 4 (i.e., RR 5). (iv) After station X sends frames 6 and 7 but no acknowledgment is yet being received.