Which of the following wave functions satisfies the wave equation

Which of the following wave functions satisfies th

D(x,t)=Acos(kx+?t)
D(x,t)=Asin(kx+?t)
D(x,t)=A(cos kx + cos ?t)
For the wave of part (b), determine the functions for the transverse velocity and transverse acceleration of a particle at point x.