If the line $y = 2x + c$ be a tangent to the ellipse $\frac{{{x^2}}}{8} + \frac{{{y^2}}}{4} = 1$, then $c = $
If the line $y = 2x + c$ be a tangent to the ellipse $\frac{{{x^2}}}{8} + \frac{{{y^2}}}{4} = 1$, then $c = $
- A
$ \pm 4$
- B
$ \pm 6$
- C
$ \pm 1$
- D
$ \pm 8$
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- [KVPY 2014]