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What is false regarding Back-Pointers scheme to revoke capability?

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What is false regarding Back-Pointers scheme to revoke capability?

(a) List of pointers is maintained with each object

(b) When revocation is required these pointers are followed

(c) This scheme is not adopted in MULTICS system

(d) These point to all capabilities associated with that object

I got this question in examination.

This question is from Protection topic in portion Protection of Operating System

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The correct answer is (c) This scheme is not adopted in MULTICS system

The explanation: None.

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