$1)$ Describe why an application developer might choose to run an application over UDP rather than TCP$.$

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$2)$ Is it possible for an application to enjoy reliable data transfer even when the application runs over UDP? If so$,$ how?

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$3)$ Suppose that a Web server runs in Host C on port $80.$ Suppose this Web server uses persistent connections, and is currently receiving requests from two different Hosts, A and B$.$ Are all of the requests being sent through the same socket at Host C$?$ If they are being passed through different sockets, do both of the sockets have port $80?$ Discuss and explain.

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