Given the following query:SELECT last_name, first_name, age, hire_date FROM employee WHERE age >40Which of the following clauses must be added to return the rows sorted by AGE, oldest first, and by LAST_NAME, from A to Z?（）
A.SORT BY age ASC, last_name
B.SORT BY age DESC, last_name
C.ORDER BY age DESC, last_name
D.ORDER BY age ASC, last_name
参考答案：C
