Which of the Following Functions Satisfy the One-Dimensional Wave Equation

Which of the following functions satisfy the one-dimensional wave equation?

A) yx, t) = y₀ coskx - ωt)
B) yx, t) = y₀ sinkx - ωt)
C) yx, t) = y₀ sinkx - ωt) + B coskx - ωt)
D) yx, t) = y₀ sin kx) · Bcos ωt)
E) All of these functions satisfy the one-dimensional wave equation.