Let us list some of the factors which could possibly influence the speed of wave propagation . (i) nature of source (ii) direction of propagation (iii) motion of source and /or observe (iv) wave length (v) internity of the wave on which of these factors if any does the speed of light in vaccum depend .

Question

$\begin{array}{1 1} \text{It does not depend upon the direction of propagation and wave length , but depends upon the motion of the source and intensity of the wave} \\\text{It does not depend upon the direction of propagation and intensity and the motion of the source but depends on the wave length } \\\text{It does not depend upon the wave length , motion of the source, intensity but depends upon the direction of propagation} \\ \text{It does not depend upon any of these factors} \end{array} $