Which of the following statements is true?
A. The body of a trigger cannot read or modify the primary, unique, or foreign key columns of a constraining table.
B. The body of a trigger cannot read or modify the primary, unique, or foreign key columns of a key-preserved table.
C. The body of a trigger cannot read or modify the primary, unique, or foreign key columns of a mutating table.
D. The body of a trigger cannot read or modify the primary, unique, or foreign key columns of a conditional table.
Answer: A
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