cal consider the following chain topology A.B...C..DE A is Sending packet to { using a reliable transport protocol Each link above contransmit one packet per second, There are no queres or other sources of delays at the rols (except the transmission delay of course) A. What is RTT between A and B B. what is the through put of stop and waite protocol at A in the absence of any losses at the hods. c. if A decides to run as licking window protocol. What is the optimum window Size it must use? D. Suppose A is running a sliding window protocol with a window Size of four in the absence of losses, what is the through put at &