Select two statements out of the four given statements $(i-iv)$ with respect to the $lac$ operon.
$(i)$ Glucose or galactose binds with the repressor and inactivates it.
$(ii)$ In the absence of lactose,the repressor binds with the operator.
$(iii)$ The $Z$-gene codes for permease.
$(iv)$ It was elucidated by Francois Jacob and Jacques Monod.

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