Choose the correct answer in the normal to the curve $x^2 = 4y$ passing $(1,2)$ is

Question

$$\begin{array}{l \qquad l \qquad l} (A)\; x + y = 3 \quad &(B)\; x -y = 3 \\(C)\; x + y = 1 \quad & (D)\; x - y = 1\end{array}$$