Operating System (OS)
Operating system

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

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Operating System (OS)
Trojan-Horse programs

None of these
are legitimate programs that allow unauthorized access
do not usually work
are hidden programs that do not show up on the system
usually are immediately discovered

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Operating System (OS)
The Memory Address Register

contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains the address of the memory location that is to be read from or stored into.
is a hardware memory device which denotes the location of the current instruction being executed.
None of these

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