Which of the Following Functions Satisfy the One-Dimensional Wave Equation $\omega$

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

A) y(x,t) = y₀ cos(kx - $\omega$ t)
B) y(x,t) = y₀ sin(kx - $\omega$ t)
C) y(x,t) = y₀ sin(kx - $\omega$ t) + B cos(kx - $\omega$ t)
D) y(x,t) = y₀ (sin kx) · B(cos $\omega$ t)
E) All of these functions satisfy the one-dimensional wave equation.