Photo electric effect supports the quantum nature of light because:
A. there is a minimum frequency of light below which no photoelectrons are emitted.
B. the maximum K.E. of photoelectrons depends only on the frequency of light and not on its intensity.
C. even when the metal surface is faintly illuminated by light of the approximate wavelength, the photoelectrons leave the surface immediately.
D. electric charge of photoelectrons is quantized.
