You issue the following command: INSERT INTO homework10 (col1, col2, col3) VALUES
(‘A’, NULL, ‘C’). The command will fail if which of the following statements is true?
a. Col1 has a PRIMARY KEY constraint enabled.
b. Col2 has a UNIQUE constraint enabled.
c. Col3 is defined as a DATE column.
d. None of the above would cause the command to fail.
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