Operating System (OS)
Fragmentation of the file system

is a characteristic of all file systems
None of these
occurs only if the file system is used improperly
can always be prevented
can be temporarily removed by compaction

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Operating System (OS)
Addressing modes

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

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