$$(b - c)(x - a)(y - a) + (c - a)(x - b)(y - b) + (a - b)(x - c)(y - c)$$ is

A

independent of $$x$$, but not of $$y$$

B

independent of $$y$$, but not of $$x$$

C

independent of both $$x$$ and $$y$$

D

independent neither of $$x$$, nor of $$y$$

E

independent of $$x$$ only if not independent of $$y$$