The following figure was generated from experimental data relation spectral black body emissive power to wave length at three temperatures T1, T2 and T3 (T1 > T2 > T3).
The conclusion is that the measurements are
(a) correct because the maxima in Ebl show the correct trend
(b) correct because Planck’s law is satisfied
(c) wrong because the Sephen Boltzmannn law is not satisfied
(d) wrong because Wien’s displacement law is not satisfied