If $x = \frac{2at}{1+t^2}$ and $y = \frac{a(1-t^2)}{1+t^2}$,where $t$ is a parameter,then $a$ represents:
- Athe length of the latus rectum of a parabola
- Bthe radius of a circle
- Cthe length of the transverse axis of a hyperbola
- Dthe length of the semi-major axis of an ellipse
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