A) Single user operating system
B) Multiuser operating system
C) Batch operating system
D) Time-sharing operating system
Correct Answer: A
Solution :
Alternatively referred to as PC DOS, IBM DOS is a text-based operating system similar to Microsoft's DOS, but only sold by IBM. DOS is a single-user, single-tasking operating system with basic kernel functions that are non-re-entrant: only one program at a time can use them and DOS itself has no functionality to allow more than one program to execute at a time.
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