Question: 3. Suppose a per-subject access control list is used. Deleting an object in such a system is inconvenient because all changes must be made to

3. Suppose a per-subject access control list is used. Deleting an object in such a system is inconvenient because all changes must be made to the control lists of all subjects who did have access to the object. Suggest an alternative, less costly means of handling deletion.

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