Cоnsider the RDT 3.0 prоtоcol for reliаbly communicаting dаta from a sender to a receiver over a channel that can lose or corrupt packets in either direction, and when the maximum delay from sender to receiver and back is not known. The FSMs for the sender and receiver are shown below, with their transitions labeled as SX and RY, respectively. Now let’s consider the sequence of sender and receiver transitions that would happen when one or more of the following complications occur: a packet (data or ACK) is lost, a timer times out (prematurely or not), or a message is corrupted. One or more of these events has occurred to produce the sequence of transitions below. In the sequence below, one transition has been omitted and replaced with a "*". After the following transition sequence S0 and R0, what is/are the possible transitions that could be (To indicate the possible transition, enter S or R, followed by an index)? You must explain your answer.