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Which of the following is the first widely used operating system?

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Which of the following is the first widely used operating system?

(a) MS-DOS

(b) windows XP

(c) android

(d) CP/M

The question was posed to me during an interview.

The query is from Operating Systems topic in division Real Time Operating systems of Embedded Systems

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The correct choice is (d) CP/M

The best I can explain: The first widely used operating system is the CP/M which is developed for Intel 8080 and the 8”floppy disk system.

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