A sender and receiver are communicating over a TCP connection. The receiver has already received from the sender all bytes up through byte 260. Suppose the sender then sends three consecutive segments to the receiver. The first, second, and third segment contain 80, 80, and 40 bytes of data, respectively. In the first segment, the sequence number is 261, the source port number is 302, and the destination port number is 80. The receiver sends an acknowledgment whenever it receives a segment from the sender.

(a) In the second segment sent from the sender to the receiver, what are the sequence number, source port number, and destination port number?

(b) After successfully sends an acknowledgment to the sender about the first segment, the receiver receives the second segment. In response to it, the receiver sends the acknowledgment for this segment. What is the acknowledgment number, the source port number, and the destination port number in this acknowledgment?

(c) If the third segment arrives before the second segment, in the acknowledgment of the first arriving segment, what is the acknowledgment number?