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The eccentricity of ellipse ax^2 + by^2 ...

The eccentricity of ellipse `ax^2 + by^2 + 2gx + 2fy + c = 0` if its axis is parallel to x-axis is (A) `sqrt((a+b)/(4)` (B) `sqrt((a-b)/(2)` (C) `sqrt((b-a)/(a)` (D) `sqrt((b-a)/(b)`

A

`sqrt(((b-a)/(b)))`

B

`sqrt(((a+b)/(b)))`

C

`sqrt(((a+b)/(a)))`

D

none of these

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