Operating System (OS)
Operating system

provides a layered, user-friendly interface
None of these
All of these
enables the programmer to draw a flowchart
links a program with the subroutines it references

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Operating System (OS)
Addressing structure

All of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
defines the fundamental method of determining effective operand addresses
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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