Part 1: Explain what actions the memory management unit and operating system take during a page fault on a computer that implements virtual memory and has been running for some time. There are several steps. Be specific. In your answer address what effect this has on performance. Part 2: What actions does the operating system take when a program issues the open and close operations for a file that is to be read from disk? For a file that is to be created? (There are several actions that take place. The textbook is a better source than Google for this question and most of the others. The book will tell you about "open." From there, you should be able to figure out "create" and "close.") Part 3: Moving a file to a different directory on the same disk does not require making a new copy of the data in the file. Explain why not. What does happen when a file is moved from one directory to another on the same disk? Part 4: Explain in detail what is meant by the working set of a process. (Use the textbook! What's on the Microsoft web page is wrong, and will get you a zero on this part of the assignment.) Describe what happens if the size of the working set is greater than the available main memory (RAM). What is that condition called