A web client and web server are running on the same uniprocessor computer. They have an open connection and are ready to send$/$receive web requests. List a possible sequence of user$-$mode$/$kernel$-$mode boundary crossings $($counting one for each direction, and including interrupts$)$ needed for the client to issue a simple web request, the server to receive the request and fetch the data from the file system, and for the server to send the data to the client. Assume that there is a low priority background task running on the processor, the current directory is cached, but the requested file is not in the server cache or the file system cache. Also assume that both the request and the requested file data are small $($e$.$g$.,$ they fit inside a single disk block$).$ You may assume any of the file systems described in this chapter, provided you label which one you are assuming.