Suppose Host A sends three TCP segments back to back to Host B over a TCP connection. The first segment has sequence number 80; the second has sequence number 120, and the last one has sequence number 160; a. How much data is in the first segment? b. Suppose that the first segment is received by B and an ACK is received by A. If the second segment is lost but the third segment arrives at B. In the next acknowledgment that Host B sends to Host A, what will be the acknowledgment number?