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A small bob attached to a light inextensible thread of length \( l \) has a periodic time T when allowed to vibrate as a simple pendulum. The thread is now suspended from a fixed end \( \mathrm{O} \) of a vertical rigid rod
\( \mathrm{P} \) of length \( \frac{3 l}{4} \) (as in figure). If now the pendulum performs periodic oscillations in this arrangement,

W the periodic time will be
(A) \( \frac{3 \mathrm{~T}}{4} \)
(B) \( \frac{\mathrm{T}}{2} \)
(C) \( \mathrm{T} \)
(D) \( 2 \mathrm{~T} \)
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