Host A then sends two segments to Host B back$-$to$-$back. The first and the second segments contain $40$ and $80$ bytes of data, respectively. In the first segment, the sequence number is $97,$ Host B sends an acknowledgment whenever it receives a segment from Host Aa$.$ In the second segment sent from Host A to B$,$ what are the sequence number?b$.$ If the first segment arrives before the second segment, in the acknowledgment of the first arriving segment, what is the acknowledgment number?c$.$ If the second segment arrives before the first segment, in the acknowledgment of the first arrivingsegment, what is the acknowledgment number?d$.$ Suppose the two segments sent by A arrive in order at B$.$ The first acknowledgment arrives after the first timeout interval. What is the sequence number of the next segment that A will transmit?