Which of the following is true of an index used to support a UNIQUE constraint?()

题目内容(请给出正确答案)
Which of the following is true of an index used to support a UNIQUE constraint?()

A.It must have the UNIQUE attribute.

B.It cannot be created explicitly by the user.

C.It must have the UNIQUE and CLUSTER attributes.

D.It must have the UNIQUE WHERE NOT NULL attribute.

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