Operating System (OS)
You can add or remove program

None of Above
Delete the shortcut icon from desktop
Both A and B
Add / Remove program from control panel

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Operating System (OS)
Addressing structure

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.
All of these
defines the fundamental method of determining effective operand addresses

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Operating System (OS)
System maintenance:

is not required if the system is well written
is necessary on all systems, regardless of how good
None of these
is usually not necessary
always requires several programs

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