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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 ellipse is

A

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

B

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

C

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

D

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

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B
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