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Which four statements are true about constraints on Oracle tables?

Which four statements are true about constraints on Oracle tables?

A.

A Column can have only one CHECK Constraint.

B.

A NOT NULL Constraint can be defined at the table level.

C.

A UNIQUE constraint permits NULLS.

D.

A PRIMARY KEY Constraint can be added after a table has been created and populated.

E.

A CHECK Constraint can refer to values in other rows.

F.

A UNIQUE Constraint can use a pre-existing index on the constrained column or columns.

G.

A FOREIGN KEY Column can contain NULLS.

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