Operating System (OS)
File record length

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

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Operating System (OS)
Addressing modes

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

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