Operating System (OS)
File record length

Should always be variable
None of these
should be chosen to match the data characteristics
should always be fixed
depends upon the size of the file

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Operating System (OS)
Addressing structure

All of these
None of these
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.
defines the fundamental method of determining effective operand addresses

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