JEE Math Practice Question

Let S be the set of all real values of $$\lambda $$ such that a plane passing through the points (–$$\lambda $$2, 1, 1), (1, –$$\lambda $$2, 1) and (1, 1, – $$\lambda $$2) also passes through the point (–1, –1, 1). Then S is equal to :

1. A.{1, $$-$$1}
2. B.{3, $$-$$ 3}
3. C.$$\left\{ {\sqrt 3 } \right\}$$
4. D.$$\left\{ {\sqrt 3 , - \sqrt 3 } \right\}$$