The correct option if speeds of gamma rays, X-rays, and microwaves or ( v_γ ), ( v_X ), and ( v_m ) respectively will be:
a) ( v_γ > v_X > v_m )
b) ( v_γ = v_X = v_m )
c) ( v_γ < v_X < v_m )
d) ( v_γ < v_X > v_m )