. Draw the sender and receiver windows for a system using Go-Back-N and the window size is 7, given the following: a. Packet 0 is sent; packet 0 is acknowledged. b. Packet 1 and 2 are sent; packet 1 and 2 are acknowledged. c. Packet 3 up to 7 are sent, packet 4 is acknowledged; packet 5 lost and its timer expired. d. Packet 5,6 and 7 are resent; packets 5 through 7 are acknowledged