If the curves x^2/alpha+y^2/4=1 and y^...

If the curves `x^2/alpha+y^2/4=1 and y^2=16 x` intersect at right angles, then a value of `alpha` is

A

2

B

`4//3`

C

`1//2`

D

`3//4`

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The correct Answer is:

A

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