Which of the following statements are true about TCP? A. Suppose a sender transmits packets with sequence numbers a, a+1, a+2, a+3, a+4 Packet a+1 is lost. All other packets arrive successfully. The sender will receive packets with acknowledgment sequence numbers a+1, a+1, a+1, a+1. B. A sender in the congestion avoidance state increases its congestion window by one every RTT C. A sender in the slow start state increases its congestion window by one every