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At a certain moment, the photograph of a string on which a harmonic wave is travelling to the right is shown. Then, which of the following is true regarding the velocities of the points \( P, Q \) and \( R \) on the string.
(A) \( v_{P} \) is upwards
(B) \( v_{Q}=-v_{R} \)
(C) \( \left|v_{P}\right|\left|v_{Q}\right|=\left|v_{R}\right| \)
(D) \( \mathrm{v}_{\mathrm{Q}}=\mathrm{V}_{\mathrm{R}} \)
\( \mathrm{P} \)
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