What Is the Expression for the Transverse Velocity of the Wave

What is the expression for the transverse velocity of the wave in a string given by $y = A \sin ( k x - ? t )$ ?

A) $v = A \cos ( k x - ? t )$
B) $v = k A \cos ( k x - ?t )$
C) $\nu = - k A \cos ( k x - ? t )$
D) $\nu = - ? A \cos ( k x - ? t )$
E) $v = ? A \cos ( k x - ? t )$

Correct Answer:

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