With regards to the retina, which is CORRECT?

• A. the retina covers the inner surface of the choroids and is light sensitive everywhere except at the corneal area
• B. the optic disc contains retina that is completely free of blood vessels and is yellowish in colour
• C. the optic disc and fovea are of similar size
• D. the fovea contains no blood vessels or cones, but a high concentration or rods