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(A) simple pendulum,in practice,consists of a heavy but small-sized metallic bob suspended by a light,inextensible,and flexible string.It oscillates s

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Both $I$ and $II$

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(A) simple pendulum,in practice,consists of a heavy but small-sized metallic bob suspended by a light,inextensible,and flexible string.It oscillates simple harmonically if and only if:$(I)$ The size of the bob is negligible compared to the length of the string of the pendulum,which allows us to treat the bob as a point mass.$(II)$ The angular amplitude (the angle between the vertical mean position and the string at the extreme point) is small,typically less than $10^{\circ}$,so that the approximation $\sin 	heta \approx 	heta$ holds true.Thus,both statements are correct.

$A$ pendulum oscillates simple harmonically if and only if:
$I$. The size of the bob of the pendulum is negligible in comparison with the length of the pendulum.
$II$. The angular amplitude is less than $10^{\circ}$.
Choose the correct option.

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$A$ pendulum oscillates simple harmonically if and only if:$I$. The size of the bob of the pendulum is negligible in comparison with the length of the pendulum.$II$. The angular amplitude is less than $10^{\circ}$.Choose the correct option.