Evaluate the set of SQL statements: What is true about the set?()
- A The DESCRIBE DEPT statement displays the structure of the DEPT table.
- B The ROLLBACK statement frees the storage space occupies by the DEPT table.
- C The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist.
- D The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.