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The differential equation of a wave is
(a) \( \mathrm{d}^{2} \mathrm{y} / \mathrm{dt}^{2}=\mathrm{v}^{2} \mathrm{~d}^{2} \mathrm{y} / \mathrm{dx}{ }^{2} \)
(b) \( \mathrm{d}^{2} \mathrm{y} / \mathrm{dx}^{2}=\mathrm{v}^{2} \mathrm{~d}^{2} \mathrm{y} / \mathrm{dt}^{2} \)
(c) \( \mathrm{d}^{2} \mathrm{y} / \mathrm{dx}{ }^{2}=\frac{1}{\mathrm{v}} \mathrm{d}^{2} \mathrm{y} / \mathrm{dt}^{2} \)
(d) \( \mathrm{d}^{2} \mathrm{y} / \mathrm{dx}{ }^{2}=-\mathrm{vd}^{2} \mathrm{y} / \mathrm{dt}^{2} \)
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