Given below is the representation of the extent of global diversity of invertebrates. What groups the four portions (A-D) represent respectively :-

1. A. A – Insects, B – Crustaceans, C – Other animal groups, D – Molluscs
2. B. A – Crustaceans, B – Insects, C – Molluscs, D – Other animal groups
3. C. A – Molluscs, B – Other animal groups, C – Crustaceans, D – Insects
4. D. A – Insects, B – Molluscs, C – Crustaceans, D – Other animal groups

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