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单项选择题 Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE Which UPDATE statement is valid?（）

A、UPDATE employees SET first_name = 'John' SET last_name ='Smith' WHERE employee_id = 180;

B、UPDATE employees SET first_name = 'John', SET last_name ='Smith' WHERE employee_id = 180;

C、UPDATE employees SET first_name = 'John' AND last_name ='Smith' WHERE employee_id = 180;

D、UPDATE employees SET first_name = 'John', last_name ='Smith' WHERE employee_id = 180;

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