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If x = (2at)/(1 + t^2) , y = (a(1-t^2) ...

If ` x = (2at)/(1 + t^2) , y = (a(1-t^2) )/(1 + t^2)` , where t is a parameter, then a is

A

the length of the latusrectum of a parabola

B

the radius of a circle

C

the length of the transverse is of a hyperbola

D

the length of the semi-major is of an elipse

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B
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