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The EMPLOYEE tables has these columns: You want to display the name and annual salary multiplied by the commission_pct for all employees. For records that have a NULL commission_pct, a zero must be displayed against the calculated column. Which SQL statement displays the desired results?（）
A:SELECT last_name, (salary * 12) * commission_pct   FROM EMPLOYEES;
B:SELECT last_name, (salary * 12) * IFNULL(commission_pct, 0)   FROM EMPLOYEES;
C:SELECT last_name, (salary * 12) * NVL2(commission_pct, 0)   FROM EMPLOYEES;
D:SELECT last_name, (salary * 12) * NVL(commission_pct, 0)   FROM EMPLOYEES;

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出自：Oracle认证

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