Disk Operating System (DOS) Question:
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..... 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


a. Operating system

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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
..... is the layer of a computer system between the hardware and the user program.

a. Operating environment
b. Operating system
c. System environment
d. None