$1.$ What do we mean when we say that TCP is self$-$clocking? Why is TCP self clocking?

$2.$ Why do TCP and UDP messages use ports? Describe a situation where two computers might need to have two separate TCP conversations running at the same time.

Figure $1$: Transmission speed over time of two TCP conversations. The first $($orange$)$ begins at $15$:$04$:$03$ and the second $($blue$)$ begins at $15$:$14$:$05.$

$3.$ Consider the diagram in Figure $1.$ Answer with at least a full sentence.

$($a$)$ Which TCP flavor is being used for each of these TCP connections? How can you tell?

$($b$)$ At what times do these TCP conversations detect congestion?

$($c$)$ How did these two TCP conversations know there was congestion? Reference the self$-$clocking property of TCP in your answer.

$4.$ Consider the diagram in Figure $1.$ Answer with at least a full sentence.

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$($a$)$ The transmission speeds of these two conversations are getting closer and closer together as time goes on$.$ Why is that happening?

$($b$)$ If a third TCP conversation started up using the exact same TCP flavor with the same rules, would the same thing happen? Why or why not?