Operating System (OS)
A page fault

is an error is a specific page
is an access to a page not currently in memory
is a reference to a page belonging to another program
None of these
occurs when a program accesses a page of memory

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Operating System (OS)
Addressing structure

defines the fundamental method of determining effective operand addresses
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
All of these

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