T$6\mathrm{.}2$a: A page fault handler has to deal differently with two types of pages when it comes to eviction and loading of pages from$/$into physical memory:

named entries $($memory mapped files, such as code of a program$)$

anonymous mappings $($page not backed by a file, such as the heap and stack of a program$)$

Which of the following statements is true?

$["",""]$

Named entries contain important data that always needs to be written back to disk before dropping the page.

$["",""]$

Memory mapped files are always mapped read only, whereas anonymous mappings can be used for writable memory.

$["",""]$

Anonymous mappings $($with modifications$)$ have to be written to a page file or swap device before eviction.

$["",""]$

A page that was evicted from physical memory needs to be loaded to exactly the same physical memory address if a user program accesses that page again after the eviction.