Question 13 (2.5 points) In a network using the Selective-Repeat protocol with m = 4 and the sending window of size 8, the value of variables are Sf = 52, Sn = 57, and Rn = 54. Packet 55 has already been acknowledged at the sender site; packets 55 and 56 are received out-of-order at the receiver site. Assume that the network does not duplicate the packets. Match the packet sequence number with the packet state. Note: the sequence number provided is boundless counter, the counter field in the packet is modulo 16. 58 52 54 50 1. Not Sent 2. Sent, but not received 3. Sent, received, but pending Acknowledge 4. Sent, received and Acknowledged 56