Suppose Host A sends four TCP segments $($after three way handshake and some data

transmission$)$ to Host B over a TCP connection. The first segment has sequence number $1001$;

the second has sequence number $2001,$ the third has sequence number $2501$ and the last one

has sequence number $3501($contians $200$ bytes data$).$ Assume sequence number used by B

starts at $1$ and the messages sent from B to A contains $200$ bytes of data each.

If the first segment sent from A to B gets lost but the remianing three segments sent from A

are received by host B$.$ For the three segment received by B$,$ B sends ACK segment

successfully. What is the sequence number for the next segment A is going to send $(1001,$

$3701,601$ or something else$)?$ Briefly illustrate how you get this answer.