Answer True or False to the following questions and briefly justify your answer: (a) With the Selective Repeat protocol, it is possible for the sender to receive an ACK for a packet that falls outside of its current window. (b) With Go-Back-N, it is possible for the sender to receive an ACK for a packet that falls outside of its current window. (c) The Stop\&Wait protocol is the same as the SR protocol with a sender and receiver window size of 1 . (d) Selective Repeat can buffer out-of-order-delivered packets, while GBN cannot. Therefore, SR saves network communication cost (by transmitting less) at the cost of additional memory.