47. In 1900, the German physicist Max Planck formulated an equation that fit the observed radiance curves for
blackbody radiation at all wavelengths: R(λ, T) =
, where ℎ is Planck’s constant, c is the speed of light, λ is wavelength, k is Boltzmann’s constant, and T is the absolute temperature. If we integrate the equation over all wavelengths to calculate the total power radiated per unit area, the Stefan-Boltzmann law for blackbody radiation can be derived. Assume A is the area of the radiating surface. Note that， where Γ(n) is the gamma function and  ζ(n) is the Riemann zeta function.
For references,. What is the Stefan-Boltzmann law for blackbody radiation?
(A)
(B)
(C)
(D)

(E)