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The line y=2x+c is tangent to the parabo...

The line `y=2x+c` is tangent to the parabola `y^(2)-4y-8x=4` at a point whose abscissa is `alpha`, then the ordered pair `(alpha, C)` isn

A

`(-(1)/(2), 4)`

B

`(-(1)/(2), 5)`

C

`(4, 5)`

D

`(-(1)/(2), (1)/(2))`

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The correct Answer is:
B
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