Disk Operating System (DOS) Question:
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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

Answer:

d. All the Above

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______ is used in operating system to separate mechanism from policy.

a. Single level implementation
b. Two level implementation
c. Multi level implementation
d. None		Essential files of MS DOS are:

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