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Which of the following provides a buffer between the user and the low-level interfaces to the hardware?

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Which of the following provides a buffer between the user and the low-level interfaces to the hardware?

(a) operating system

(b) kernel

(c) software

(d) hardware

This question was addressed to me in an interview for internship.

This interesting question is from Operating Systems topic in chapter Real Time Operating systems of Embedded Systems

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Correct answer is (a) operating system

To explain: The operating system is software which provides a buffer between the low-level interfaces to the hardware within the system and the user.

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