Chief functions of the rods and cones in the eye of a vertebrate are

• A
  Rods are important for vision in bright light and cones in dim light
• B
  Rods are important for vision in dim light and cones in bright light
• C
  Rods are involved in colour vision and cones in distinguishing intensities of light
• D
  Rods and cones are both important for vision in dim light