Which two statements are true regarding constraints?

Question

Options

• AA foreign key cannot contain null values.
• BA column with the unique constraint can contain null values.
• CA constraint is enforced only for the insert operation on a table.
• DA constraint can be disabled even if the constraint column contains data.
• EAll constraints can be defined at the column level as well as the table level.

• A
  17% (7)
• B
  71% (29)
• C
  7% (3)
• E
  5% (2)

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