Disk Operating System (DOS) Question:
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Which type of command in DOS needs additional files for their execution?

a. Internal commands
b. External commands
c. Batch commands
d. Redirectors


b. External commands

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While working with MS-DOS which command is used to copy all files with extension .txt into one file named all.txt?

a. Copy a: *.txt
b. Copy *.txt a:
c. Copy *.txt c:
d. Copy *.txt all.txt
..... runs on computer hardware and serve as platform for other software to run on:

a. Operating system
b. Application software
c. System software
d. All