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The eccentricity of an ellipse, with its...

The eccentricity of an ellipse, with its centre at the origin, is 1/2. If one of the directrices is x = 4, then the equation of the ellipse is

A

`3x^(2)+4y^(2)=12`

B

`3x^(2)+4y^(2)=49`

C

`3x^(2)+4y^(2)=1`

D

`4x^(2)+3y^(2)=12`

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A
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