My Ans: D
From 1: K = 0 & 1 => Question says Non Zero integer, so K = 1
From 2: K = 1
Where am I making the mistake?
(1) K=1 or -1 not OK
(2) K=1 OK
Remember 0^0 is an uncertain case and cannot be solved with simple school math methods. Downward the forum, there is a long discussion over the matter. The rule is simple -- if you see 0^0, neglect it.
I always write in such questions that integers cannot be zero eliminating possible a long and senseless discussion.