【单选题】
Examine the structure of the EMPLOYEES table:<br /> <img src="https://nimg.ppkao.com/2018-08/yiyu/2018080116484483696.jpg?sign=e6b5d64a1eb3f2e3a17aa06900aef6d8&t=62d228bb" /><br /> 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);
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