A metal surface has work function equivalent to energy of wavelength of light 4500angtram when a beam of light with lambda 4000 angstrom fall on it

a metal surface has work function equivalent to energy of wavelength of light 4500angtram when a beam of light with Lambda 4000 angstrom fall on it. (a)photoelectrons will not be emitted. (b) photoelectrons will be emitted with certain speeds (c) photoelectrons will be emitted with zero speeds (d) photoelectrons may or may not be emitted