Which two statements are true regarding constraints?

Question

Options

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

• A
  7% (2)
• B
  77% (23)
• C
  3% (1)
• E
  13% (4)

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