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Evaluate the following ALTER TABLE statement:
ALTER TABLE orders
SET UNUSED order_date;
Which statement is true?

A.
The DESCRIBE command would still display the ORDER_DATE column.

B.
ROLLBACK can be used to get back the ORDER_DATE column in the ORDERS table.

C.
The ORDER_DATE column should be empty for the ALTER TABLE command to execute successfully.

D.
After executing the ALTER TABLE command, you can add a new column called ORDER_DATE to the ORDERS table.

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