If a, b, c ∈ ℝ and $$a \neq b \neq c$$, then

$$\frac{(a - b)^{2}}{(b -a)(c - a)} + \frac{(b - c)^{2}}{(a -b)(c - a)} + \frac{(c - a)^{2}}{(a -b)(b - c)}$$

A

1

B

-1

C

3

D

-3