Choose the correct statements in reference to the photoelectric effect. $(i)$ There is no time lag between the striking of light and ejection of electrons from the metal surface. $(ii)$ The number of electrons ejected is independent of the intensity of light. $(iii)$ The elements $K$, $Rb$ and $Cs$ can show photoelectric effect when exposed to the beam of light.

• A
  $(i)$ and $(ii)$ only
• B
  $(i)$ and $(iii)$ only
• C
  $(i)$, $(ii)$, $(iii)$
• D
  $(ii)$ and $(iii)$ only