Explain Which Two Statements Are True Regarding Constraints? (Choose Two.) A. A Foreign Key Cannot Contain NULL Values B. A Columns With The UNIQUE Constraint Can Contain NULL Values C. A Constraint Is Enforced Only For The INSERT Operation On A Table D. A Constraint Can Be Disabled Even If The Constraint Column Contains Data E. All Constraints Can Be Defined At The Column Level As Well As The Table Level

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⟩ Explain Which two statements are true regarding constraints? (Choose two.) A. A foreign key cannot contain NULL values B. A columns with the UNIQUE constraint can contain NULL values C. A constraint is enforced only for the INSERT operation on a table D. A constraint can be disabled even if the constraint column contains data E. All constraints can be defined at the column level as well as the table level

B. A columns with the UNIQUE constraint can contain NULL values

D. A constraint can be disabled even if the constraint column contains data

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