Comprehension A small sphere of mass \( \mathrm{m} \) suspended by a thread is first taken aside...

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Comprehension
A small sphere of mass \( \mathrm{m} \) suspended by a thread is first taken aside so that the thread forms the right angle with the vertical and then released, then:

The angle \( \theta \) between the thread and the vertical at the moment when the total acceleration vector of the sphere is directed horizontally will be
(a) \( \cos \theta=\frac{1}{\sqrt{3}} \)
(b) \( \cos \theta=\frac{1}{3} \)
(c) \( \sin \theta=\frac{1}{\sqrt{3}} \)
(d) \( \sin \theta=\frac{1}{\sqrt{2}} \)
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