A file of size $1$ Mb is to be transmitted from A to B over a link

with a capacity of $2$ Mbps using packet switching:

A$$X$$B

Host A segments the file into segments of size S bits each and

adds $100$ bits of header to each segment, forming packets of size

Lpacket $=$ S $+100$ bits. What is the value of S that minimizes the

file transmission time from A to B$?$