TCP$-2$ Lab: Q$05\mathrm{.}3$ The first segment containing payload data $($c$).$ Did all of the data in the file alice.txt fit into this single segment?

Nope. Not even close. The alice.txt file is much larger, and so multiple TCP segments will be needed to transfer the file as part of the single application$-$level HTTP POST message.

Yes $-$ it fit! It was close $($whew$!),$ but all of the alice.txt file fit into this TCP segment. This one TCP segment is large enough to carry the single application$-$level HTTP POST message.