You want to make data in the SSN column in a table unique. However, you want the column to be able to accept only one NULL value if needed. Which of the following constraint would you use to implement the solution?

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You want to make data in the SSN column in a table unique.
However, you want the column to be able to accept only one NULL value if needed.
Which of the following constraint would you use to implement the solution?

PRIMARY KEY constraint

UNIQUE constraint

FOREIGN KEY constraint

DEFAULT constraint

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