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
None of these
Universality
Upgradability
Upward mobility

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Operating System (OS)
The Storage-to-Storage instructions

have both their operands in the main store.
which perform indicated operations on two fast registers of the machine and have the result in one of the registers
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also
None of these
All of these

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