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Which can control memory usage?

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Which can control memory usage?

(a) operating system

(b) applications

(c) hardware

(d) kernel

I got this question in an interview for job.

This interesting question is from Multitasking Operating Systems in section Real Time Operating systems of Embedded Systems

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Best answer
Right option is (d) kernel

Easiest explanation: The kernel can control the memory usage and it can also prevent the tasks from corrupting each other.

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