Let \( f(x)=\left\{\begin{array}{ll}x^{2}+4 x, & -3 \leq x \leq 0 \\ -\sin x, & 0x \leq \frac{\p...

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Let \( f(x)=\left\{\begin{array}{ll}x^{2}+4 x, & -3 \leq x \leq 0 \\ -\sin x, & 0x \leq \frac{\pi}{2} \\ -\cos x-1, \frac{\pi}{2}x \leq \pi\end{array}\right. \). Then.
(a) \( x=-2 \) is the point of global minima
(b) \( x=\pi \) is the point of global maximaa
(c) \( f(x) \) is non-differentiable at \( x=\frac{\pi}{2} \)
(d) \( f(x) \) is discontinuous at \( x=0 \)
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