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

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

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Operating System (OS)
Multiprogramming systems:

None of these
execute each job faster
are used only on large mainframe computers
are easier to develop than single programming system
execute more jobs in the same time period

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