Which of the following statements is correct?

1. A. (1) Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye.
2. B. (2) Cornea is an external, transparent and protective proteinacious covering of the eye-ball.
3. C. (3) Cornea consists of dense connective tissue of elastin and can repair itself.
4. D. (4) Cornea is convex, transparent layer which is highly vascularised.

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