Operating System (OS)
Scheduling is

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

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