The displacement time graph of a particle executing S.H.M is given in figure (sketch is schematic and not to scale)

Which of the following statements is/are true for this motion?
(A) The force is zero at $\mathrm{t}=\frac{3 \mathrm{~T}}{4}$
(B) The acceleration is maximum at $t=T$
(C) The speed is maximum at $\mathrm{t}=\frac{\mathrm{T}}{4}$
(D) The P.E. is equal to K.E. of the oscillation at $t=\frac{T}{2}$