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Which is an unsolvable problem in access-matrix?

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in Operating System by (102k points)
Which is an unsolvable problem in access-matrix?

(a) Owner override

(b) Brute force

(c) Access denied

(d) Confinement

The question was posed to me in an internship interview.

My enquiry is from Protection topic in portion Protection of Operating System

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Right answer is (d) Confinement

To explain: None.

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