Given that $E$ (in W. $\mathrm{m}^{-2}$ ) is the total hemispherical emissive power of a surface maintained at a certain temperature, which of the following statements is/are $\text{CORRECT}$?
- $E$ does not depend on the direction of the emission.
- $E$ depends on the viewfactor.
- $E$ depends on the wavelength of the emission.
- $E$ does not depend on the frequency of the emission.