A) single-user but multiple programming
B) multi- user operating system
C) multi- user and multi-programming
D) open source operating system
E) single-user operating system
Correct Answer: E
Solution :[e] DOS is the most popular single user operating system. These operating systems are mainly used on personal computers. In DOS, we cannot run another program at the same time. For this we will have to close the first program, only then we would be able to work on another program or software.
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