For a planet revolving around sun, if \( a \) and \( b \) are the respective semi-major and semi...

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For a planet revolving around sun, if \( a \) and \( b \) are the respective semi-major and semi-minor axes, then the square of its time period is proportional to
(a) \( \left(\frac{a+b}{2}\right)^{3} \)
(b) \( \left(\frac{a-b}{2}\right)^{3} \)
(c) \( b^{3} \)
(d) \( a^{3} \)
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