`y-x` curve at an instant for a wave travelling along `x-`axis on a string is shown. Slope at the point `A` on the curve, as shown, is `tan 53^(@)`.
A. Transverse velocity of the particle at point `A` is positive if the wave is travelling along positive `x-`axis.
B. Transverse velocity of the particle at point `A` is positive if the wave is travelling along negative `x-`axis of the particle at point `A`
C. Magnitude of transverse velocity of the particle at point `A` is greater than wave speed.
D. Magnitude of transverse velocity of the particle at point `A` is lesser than wave speed.