۴- اگر $A = {\frac{x}{3} | \frac{x}{3} \in N, (-2) \le x < 5}$ اعضای مجموعه $A$ برابر است با: a) {\frac{2}{3}, \frac{4}{3}} b) {\frac{1}{3}, \frac{2}{3}, \frac{-2}{3}} c) {\frac{-1}{3}, \frac{2}{3}, \frac{4}{3}} d) {\frac{2}{3}, \frac{4}{3}, \frac{-2}{3}, \frac{0}{3}}