Which one of the following best defines the term Operating System?
A. The software that allows computer users to run applications with the hardware of a specific system. Microsoft® Windows® or Apple® Computer's OS are examples of operating systems.
B. The master control program that manages a computer's internal functions and provides a means of control to the computer's operations and file system.
C. The software that manages the hardware and software interface of a computer.
D. All of the above.