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?

Universality
Upgradability
None of these
Upward compatibility
Upward mobility

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Operating System (OS)
The LRU algorithm

None of these
pages out the first page in a given area
pages out pages that have been used recently
pages out pages that have been least used recently
pages out pages that have not been used recently

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Operating System (OS)
Assembler language

is usually the primary user interface
requires fixed-format commands
is a mnemonic form of machine language
is quite different from the SCL interpreter
None of these

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