Question: The access control list for a file specifies which users can access that file, and how. Some researchers have indicated that an attractive alternative would

The access control list for a file specifies which users can access that file, and how. Some researchers have indicated that an attractive alternative would be a user control list, which would specify which files a user could access, and how. Discuss the trade-offs of such an approach in terms of space required for the lists, and the steps required to determine whether a particular file operation is permitted.

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