Answer (C) is correct . The operating system is the “mind” of the computer. It manages the communications between the different hardware components making up the system and manages the flow of data into and out of the system. Before any processing can be done, it must be up and running.
Answer (A) is incorrect because An online system is a type of application that cannot be loaded until the operating system is up and running.
Answer (B) is incorrect because A batch system is a type of application that cannot be loaded until the operating system is up and running.
Answer (D) is incorrect because A decision support system is a type of application that cannot be loaded until the operating system is up and running.
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