Reduce the following equation into normal form. Find their perpendicular distances from the origin and angle between perpendicular and the positive $x$ - axis. $ x-y=4$

Question

$\begin{array}{1 1}(A)\;p=\sqrt 2 \: units ; \alpha = 315^{\circ} \\(B)\; p= 2 \: units ; \alpha = 45^{\circ} \\(C)\; p=2\sqrt 2 \: units ; \alpha = 315^{\circ} \\(D)\;p=2\sqrt 2 \: units ; \alpha = 45^{\circ} \end{array} $