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单项选择题 Examine the structure of the EMPLOYEES table: Column name Data type Remarks EMPLOYEE_ID NUMBER NOT NULL, Primary Key LAST_NAME VARCNAR2(30) FIRST_NAME VARCNAR2(30) JOB_ID NUMBER SAL NUMBER MGR_ID NUMBER References EMPLOYEE_ID column DEPARTMENT_ID NUMBER 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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