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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

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

B

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

C

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

D

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

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b
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