Click the Exhibit button and examine the data from the EMP table. The COMMISSION column shows the monthly commission earned by the employee. Which two tasks would require subqueries or joins in order to be performed in a single step? （）
- Alisting the employees who earn the same amount of commission as employee 3
- Bfinding the total commission earned by the employees in department 10
- Cfinding the number of employees who earn a commission that is higher than the average commission of the company
- Dlisting the departments whose average commission is more than 600
- Elisting the employees who do not earn commission and who are working for department 20 in descending order of the employee ID
- Flisting the employees whose annual commission is more than 6000