A plane progressive simple harmonic sound wave of angular frequency 680 rad/s moves with speed 340 m/s in the direction which makes equal angle with each x, y, and z-axis.

A) x = A sin(kx - ωt), y = A sin(ky - ωt), z = A sin(kz - ωt)
B) x = A cos(kx - ωt), y = A cos(ky - ωt), z = A cos(kz - ωt)
C) x = A sin(kx + ωt), y = A sin(ky + ωt), z = A sin(kz + ωt)
D) x = A cos(kx + ωt), y = A cos(ky + ωt), z = A cos(kz + ωt)