If $\lambda_{m}$ denotes the wavelength at which the radioactive emission from a black body at a temperature T K is maximum, then :-

Question

( A ) $\lambda_{m} \propto T^{-4}$
( B ) $\lambda_{m} \propto T$
( C ) $\lambda_{m}$ is independent of T
( D ) $\lambda_{m} \propto T^{-1}$