\[(a)\;\sqrt {GM \bigg(\frac{2}{r}-\frac{1}{a}\bigg)} \quad (b)\;\sqrt {GM \bigg(\frac{1}{r}-\frac{1}{a}\bigg)} \quad (c)\;\sqrt {GM \bigg(\frac{1}{r}-\frac{2}{a}\bigg)} \quad (d)\;\sqrt {\frac{GMr}{2a^2}} \]

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