Assume two end-hosts communicate using the sliding window protocol. Does the following figure indicate which sliding window protocol, stop-and-wait, Go-Back-N, or selective repeat ARQ is being used, or there is no enough information to tell? Why? (Explain your answer briefly using one or two sentences.) Does the following figure indicate which sliding window protocol, stop-and-wait, Go- Back-N, or selective repeat ARQ is being used, or there is no enough information to tell? Why? (Explain your answer briefly using one or two sentences.) Stop-and-Wait ARQ protocol is used by two computers to communicate over a channel with the rate of 56kbps and one way propagation delay of 100ms. The data frame size is 256 bytes (1 byte = 8 bits), and ACK frame is 8 bytes. Assume an ideal channel with no error, and the header overhead and processing delay are negligible. Find the transmission efficiency of Stop-and-Wait ARQ. (Give the detail derivation steps.)