The value of $c$, for which the line $y = 2x + c$ is a tangent to the circle ${x^2} + {y^2} = 16$, is
The value of $c$, for which the line $y = 2x + c$ is a tangent to the circle ${x^2} + {y^2} = 16$, is
- A
$ - 16\sqrt 5 $
- B
$20$
- C
$4\sqrt 5 $
- D
$16\sqrt 5 $
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