Operating System (OS)
In MS-DOS, relocatable object files and load modules have extensions

None of these
.OBJ and .COM or .EXE, respectively
.DAS and .EXE, respectively
.COM and .OBJ, respectively
.EXE and .OBJ, respectively

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Operating System (OS)
Round-robin scheduling

None of these
gives each task the same chance at the processor
allows processor-bound tasks more time in the processor
allows interactive tasks quicker access to the processor
is quite complex to implement

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