​Which of the Following Statements About Creating Constraints Is Incorrect?​

Multiple Choice

​Which of the following statements about creating constraints is incorrect?​

A) ​If a constraint applies to more than one column,the constraint must be created at the table level.
B) ​Using the column level approach,the definition of the constraint is included as part of the column definition.
C) ​When you create constraints at the column level,the constraint being created applies to the column specified.
D) ​The NOT NULL constraint can be created at either the column level or the table level.