Good vision depends on adequate intake of carotene-rich food. Select the most appropriate option from the following statements.
$I.$ Vitamin $A$ derivatives are formed from carotene.
$II.$ Photopigments are embedded in the membrane discs of the outer segment.
$III.$ Retinal is a derivative of Vitamin $A$.
$IV.$ Retinal is a part of all photopigments that absorb light.

• A
  $(I)$ and $(II)$
• B
  $(I), (III)$ and $(IV)$
• C
  $(I)$ and $(III)$
• D
  $(I), (II)$ and $(IV)$