A plane progressive transverse wave is passing through medium along the positive x-axis at the given instant time. The nature of the displacement, position (y – x) graph is as shown in figure. Which of the following statements are correct.(Consider A, B, C are three particles of the vibrating string) 

elastic potential energy per unit length of the string at the point B is more than that at points A and C

elastic potential energy per unit length of the string at the point C is more than that at points A and B

velocity of the particles at A is along negative y – axis direction

velocity of the particle at C is along positive y – axis.