(c) Consider the following file server, where a single process is running on a single- core machine. It takes 20 ms to fetch the requested file if it is in the (disk) cache. If a disk operation is needed, as is the case for one-third of the requests, an additional 80 ms is needed. Compute how many requests/sec the server can handle if it is single threaded. How does this change when the server is (10 marks) multithreaded