If f(x) is a real valued odd function , then which one of the following is incorrect ?
A. f(x)−f−(−x) / 2 is an odd function.
B. f(x)+f(−x) / 2 is an even function.
C. [|f(x)|+2] is an even function, [⋅] denotes the greatest integer function.
D. f(x)−f(−x) / 2 is neither even nor odd.