Select the two correct statements out of the four $(i-iv)$ statements given below about the lac operon.
$(i)$ Glucose or galactose may bind with the repressor and inactivate it.
$(ii)$ In the absence of lactose,the repressor binds with the operator region.
$(iii)$ The $z$-gene codes for permease.
$(iv)$ This was elucidated by Francois Jacob and Jacques Monod.
The correct statements are:

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