Consider a computer system with three users: Alice, Bob, and Cindy. Alice owns file X$,$

and Bob and Cindy can read it$.$ Bob owns file Y$,$ and Cindy can read and write the file Y$,$ but

Alice can only read it$.$ Cindy owns file Z$,$ but neither Alice nor Bob can read or write it$.$ If a

user owns a file, he$/$she can also execute the file