Which of the following characteristic features always holds true for the corresponding group of animals?

1. A. (1) Cartilaginous endoskeleton → Chondrichthyes
2. B. (2) Viviparous → Mammalia
3. C. (3) Possess a mouth with an upper and a lower jaw → Chordata
4. D. (4) 3 - chambered heart with one incompletely divided ventricle → Reptilia

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