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What is not true regarding ‘Fence’?

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in Operating System by (102k points)
What is not true regarding ‘Fence’?

(a) It is implemented via hardware register

(b) It doesn’t protect users from each other

(c) It good to protect OS from abusive users

(d) Its implementation is unrestricted and can take any amount of space in Operating system.

The question was posed to me during an interview for a job.

My enquiry is from Protection in section Protection of Operating System

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Correct answer is (d) Its implementation is unrestricted and can take any amount of space in Operating system.

Explanation: None.

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