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

b. Operating system

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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	The primary purpose of an operating system is ..... . a. To make the most efficient use of the computer hardware b. To allow people to use the computer c. To keep systems programmers employed d. To make computers easier to use