Let $y = x + c _ { 1 } , y = x + c _ { 2 }$ be the two tangents to the ellipse $x ^ { 2 } + 4 y ^ { 2 } = 1$. What is the value of $\left| c _ { 1 } - c _ { 2 } \right|$?\\
(A) $\sqrt { 2 }$\\
(B) $\sqrt { 5 }$\\
(C) $\frac { \sqrt { 5 } } { 2 }$\\
(D) 1