Operating System (OS)
The higher versions of the operating systems are so written that programs designed for earlier versions can still be run. What is it called?

Upward compatibility
Upgradability
Upward mobility
Universality
None of these

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Operating System (OS)
Addressing modes

All of these
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.
None of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.

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