At Event B, the following actions will take place

A)		ACK0 received, pk4 sent, sender window doesn't move
B)		ACK0 received, pk4 sent, sender window moves to start at 1
C)		ACK0 received, pk2 resent
D)		ACK0 received, pk1, pk2 and pk3 resent

Host A Host B pkt0 sent 01234567 pktl sent 1 2 3 4 5 6 789 pkt0 rcvd, delivered, ACKO sent :01 2 3 4567 pkt2 sent 01 23 456789 pkt1 revd, delivered, ACK1 sent :0123 456789 (loss) pkt3 sent, window full: 01234567 8 9 : Event A Event B : Event C Event F Event D pkt2 TIMEOUT : Event E