Disc Operating System (DOS)
Full form of MS-DOS is

Micro Simple Disk Operating System
Micro Soft Disk Operating System
Micro System Disk Operating System
Micro Sort Disk Operating System

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Disc Operating System (DOS)
Which of the following applies to external DOS commands?

External commands reside in RAM until called
External commands can only be executed from a batch file.
External commands are stored on disk separately from COMMAND.COM
External commands must always be used with the /e switch

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