Disk Operating System (DOS) Question:
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Essential files of MS DOS are:

a. Command.com
b. Io.sys
c. Msdos.sys
d. All of above

Answer:

d. All of above

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Unix Operating System is an:

a. Multi User Operating System
b. Time Sharing Operating System
c. Multi Tasking Operating System
d. All the Above		Which command is used to open the directory?

a. Open
b. Chdir
c. Move
d. All of above