The function $f(x)=\Large \frac{4-x^2}{4x-x^3}$ is

Question

$$\begin{array}{1 1}(A) \;discontinuous \;at\; only\; one\;point.\\(B)\;discontinuous\;at\;exactly\;two\;points.\\ (C)\;discontinuous\;at\;exactly \;three\;points.\\(D)\;none\;of\;these\end{array}$$