An operating system (OS) is the software that handles all of the other application programs in a computer after being loaded into the machine by a boot program. The correct option is A.
An operating system (OS) is the software that handles all of the other application programs in a computer after being loaded into the machine by a boot program. The application programs interact with the operating system by requesting services via a predefined application program interface (API).
The feature in Windows that allows you to install patches to ensure your operating system is secure is the Repair feature.
Hence, the correct option is A.
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