The definition of a word comprises the following points ______ .
(1) a minimal free form of a language
(2) a sound unity
(3) a unit of meaning
(4) a form that can function alone in a sentence
A、(1) and (2)
B、(1) (2) and (3)
C、(2) (3) and (4)
D、(1) (2) (3) and (4)
【正确答案】：D
