When does a page fault occur on a running system?
A. A page fault occurs whenever memory pages are called by a program or process from the paging file on disk.
B. A page fault occurs whenever memory pages encounter an error and cannot be utilized.
C. A page fault occurs when a program is unable to access a paged file.
D. A page fault occurs when an attempt to page information from memory to the paging file is unsuccessful.
Answer: A
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