A bag contains 5 red, 4 green and 3 black balls. Three balls are drawn out from it at random. Find the probability of drawing exactly 2 red balls

A

$$\dfrac{7}{21}$$

B

$$\dfrac{5}{12}$$

C

$$\dfrac{7}{12}$$

D

$$\dfrac{5}{22}$$

E

$$\dfrac{7}{22}$$