单选题：What does the "set user ID" do?
What does the "set user ID" do? @[D](1)
A. It prevents files from being deleted by nowowners.
B. It prevents files from being deleted by nonowners except root.
C. It prevents files from being deleted by nonowners including root.
D. It allows a file to be executed on behalf of the owner.
A.It prevents files from being deleted by nowowners.
B.It prevents files from being deleted by nonowners except root.
C.It prevents files from being deleted by nonowners including root.
D.It allows a file to be executed on behalf of the owner.
答案：D
A. It prevents files from being deleted by nowowners.
B. It prevents files from being deleted by nonowners except root.
C. It prevents files from being deleted by nonowners including root.
D. It allows a file to be executed on behalf of the owner.
A.It prevents files from being deleted by nowowners.
B.It prevents files from being deleted by nonowners except root.
C.It prevents files from being deleted by nonowners including root.
D.It allows a file to be executed on behalf of the owner.
答案：D