单项选择题
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
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