Match List-$I$ with List-$II$ with respect to the human eye.

List-$I$	List-$II$
$A$. Fovea	$I$. Visible coloured portion of eye that regulates diameter of pupil.
$B$. Iris	$II$. External layer of eye formed of dense connective tissue.
$C$. Blind spot	$III$. Point of greatest visual acuity or resolution.
$D$. Sclera	$IV$. Point where optic nerve leaves the eyeball and photoreceptor cells are absent.

Choose the correct answer from the options given below:

• A
  $A-II, B-I, C-III, D-IV$
• B
  $A-III, B-I, C-IV, D-II$
• C
  $A-IV, B-III, C-II, D-I$
• D
  $A-I, B-IV, C-III, D-II$