Examine the structure of the EMPLOYEES table: You need to create an index called NAME_IDX on the first name and last name fields of the EMPLOYEES table. Which SQL statement would you use to perform this task?（）
- A CREATE INDEX NAME_IDX (first_name, last_name);
- B CREATE INDEX NAME_IDX (first_name AND last_name);
- C CREATE INDEX NAME_IDX ON (first_name, last_name);
- D CREATE INDEX NAME_IDX ON employees (first_name AND last_name);
- E CREATE INDEX NAME_IDX ON employees(first_name, last_name);
- F CREATE INDEX NAME_IDX FOR employees(first_name, last_name)