Operating System (OS)
Scheduling is

None of these
not required in uniprocessor systems
allowing jobs to use the processor
the same regard-less of the purpose of the system
unrelated to performance consideration

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Operating System (OS)
The Memory Buffer Register (MBR)

is a hardware memory device which denotes the location of the current instruction being executed.
None of these
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".
contains the address of the memory location that is to be read from or stored into.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

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Operating System (OS)
Operating system

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

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