What mechanism does TCP use for flow control? а. The receiver indicates how much data it is able to receive in the "receive window" field of the TCP header. O b. The sender estimates its congestion...

Extracted text: What mechanism does TCP use for flow control? а. The receiver indicates how much data it is able to receive in the "receive window" field of the TCP header. O b. The sender estimates its congestion window, increasing it when it receives ACKS for previously sent data, and reducing it when a loss even occurs, like the expiration of the retransmission timer or three duplicate ACKS. с. TCP does not use flow control.