The number of integers $n$ for which the cubic equation $X ^ { 3 } - X + n = 0$ has 3 distinct integer solutions is: (A) 0 (B) 1 (C) 2 (D) infinite.
The number of integers $n$ for which the cubic equation $X ^ { 3 } - X + n = 0$ has 3 distinct integer solutions is:\\
(A) 0\\
(B) 1\\
(C) 2\\
(D) infinite.