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Whenever a process needs I/O to or from a disk it issues a ____

91. Whenever a process needs I/O to or from a disk it issues a ____.

1. System call to the operating system
2. Separate directory structure
3. Only A
4. Only B
5. Both A and B

Answer: C) Only A

Explanation:

Whenever a process needs I/O to or from a disk it issues a System call to the operating system.