Let \( f(x)=|\sin x| \). Then (A) \( f \) is everywhere differentia...

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Let \( f(x)=|\sin x| \). Then
(A) \( f \) is everywhere differentiable
P
(B) \( f \) is everywhere continuous but not differentiable at \( x=n \pi, n \in \mathbf{Z} \).
W
(C) \( f \) is everywhere continuous but not differentiable at \( x=(2 \mathrm{n}+1) \frac{\pi}{2} \), \( n \in \mathbf{Z} \).
(D) none of these
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