Let $P$ be a point on the ellipse $x ^ { 2 } + 4 y ^ { 2 } = 4$ which does not lie on the axes. If the normal at the point $P$ intersects the major and minor axes at $C$ and $D$ respectively, then the ratio $P C : P D$ equals\\
(a) 2 .\\
(B) $1 / 2$.\\
(C) 4 .\\
(D) $1 / 4$.