If $y = mx + c$ is tangent on the ellipse $\frac{{{x^2}}}{9} + \frac{{{y^2}}}{4} = 1$, then the value of $c$ is
If $y = mx + c$ is tangent on the ellipse $\frac{{{x^2}}}{9} + \frac{{{y^2}}}{4} = 1$, then the value of $c$ is
- A
$0$
- B
$3/m$
- C
$ \pm \sqrt {9{m^2} + 4} $
- D
$ \pm 3\sqrt {1 + {m^2}} $
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