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