Suppose Host A sends four TCP segments to Host B over a TCP connection. The first segment has sequence number 80; the second has sequence number 125, the third has sequence number 170 and the last one has sequence number 220;

(a) How much data is in the third segment?

(b) Suppose that the first and second segments are received by B and the ACK of those two segments sent from B is received by A. If the third segment is lost but the last segment arrives at B. In the next acknowledgment that Host B sends to Host A, what will be the acknowledgment number?

(c) If all segments are received by Host B, and the last segment contains 50 bytes of data, what is the acknowledgment number contained in the last ACK message sent from B to A.