& explain why

For each of the following statements, state if they are true or false. (a) A cache using a write-back policy writes back to the main memory simultaneously as it writes to the cache. (b) Two important properties of a virtual memory are to give the illusion of a very large memory and to give memory protection between two concurrently running programs. (c) A unit called the memory management unit (MMU) is a common solution to perform fast translations from virtual page numbers to physical page numbens (d) Modern high-performance processors do not use multi-level caches because they are too expensive and give little performance benefits