单选题Evaluate the set of SQL statements: CREATE TABLE dept (deptno NUMBER(2), dname VARCNAR2(14), 1oc VARCNAR2 (13)); ROLLBACK; DESCRIBE DEPT What is true about the set?（）A The DESCRIBE DEPT statement displays the structure of the DEPT table.B The ROLLBACK
题目
单选题
Evaluate the set of SQL statements: CREATE TABLE dept (deptno NUMBER(2), dname VARCNAR2(14), 1oc VARCNAR2 (13)); ROLLBACK; DESCRIBE DEPT 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.