Four particles, each of mass \( M \), move along a circle of radius \( R \) under the action of ...

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Four particles, each of mass \( M \), move along a circle of radius \( R \) under the action of their mutual
\( \mathrm{P} \) gravitational attraction. The speed of each particle is
\( \mathrm{W} \)
(a) \( \frac{G M}{R} \)
(b) \( \sqrt{2 \sqrt{2} \frac{G M}{R}} \)
(c) \( \sqrt{\frac{G M}{R}(2 \sqrt{2}+1)} \)
(d) \( \sqrt{\frac{G M}{R} \frac{2 \sqrt{2}+1}{4}} \)
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