A smooth chain \( A B \) of mass \( m \) rests against a surface in the form of a quarter of a c...

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A smooth chain \( A B \) of mass \( m \) rests against a surface in the form of a quarter of a circle of radius \( R \). If it is released from rest, the velocity of the chain after it comes over the horizontal part of the surface is
(a) \( \sqrt{2 g R} \)
(b) \( \sqrt{g R} \)
(c) \( \sqrt{2 g R\left(1-\frac{2}{\pi}\right)} \)
(d) \( \sqrt{2 g R(2-\pi)} \)
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