Go back to 1Z0-031 - Oracle9i Database: Fundamentals I

Question :-

Question 161 Which three statements define the properties of a column that has the UNIQUE constraint that is enforced using ENABLE and VALIDATE clause? (Choose three.)
The column is indexed.
The column cannot have null values.
The column cannot have any other constraints defined.
The column cannot have duplicate values.
A column in another table can reference this column.

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