Select the two correct statements out of the four $(i-iv)$ 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.

• A
  $(ii) \text{ and } (iv)$
• B
  $(i) \text{ and } (iii)$
• C
  $(ii) \text{ and } (iii)$
• D
  $(i) \text{ and } (ii)$