If mass of earth is \( M \), radius is \( R \) and gravitational constant is \( G \), then work ...

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If mass of earth is \( M \), radius is \( R \) and gravitational constant is \( G \), then work done to take \( 1 \mathrm{~kg} \) mass from earth surface to infinity will be
[RPET 1997]
(a) \( \sqrt{\frac{G M}{2 R}} \)
(b) \( \frac{G M}{R} \)
(c) \( \sqrt{\frac{2 G M}{R}} \)
(d) \( \frac{G M}{2 R} \)
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