Suppose that the browser makes an HTTP request to the server for an HTTP object, that the browser has

a copy of that object in its cache, but that copy may or may not be up to date in its cache $($and so the

browser requests the object using the HTTP If$-$Modified$-$Since header field$).$ Assume that the time taken

to transmit an HTTP reply $($by the sender into the TCP connection$)$ that contains a requested object in the

body of an HTTP reply is $50$ msec, but that the time taken to transmit a HTTP reply with a $"304$ Not

Modified" reply code without an included object is negligible $($e$.$g$.,$ zero$).$ You can assume that a TCP

connection has already been set up$,$ so do not include that delay in your answer b