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To access the services of operating system, the interface is provided by the ___________

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To access the services of operating system, the interface is provided by the ___________

(a) System calls

(b) API

(c) Library

(d) Assembly instructions

I had been asked this question in an internship interview.

This is a very interesting question from Basics topic in chapter Processes of Operating System

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Right answer is (a) System calls

Best explanation: To access services of the Operating System an interface is provided by the System Calls. Generally, these are functions written in C and C++. Open, Close, Read, Write are some of most prominently used system calls.

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