The following are the statements about non-chordates: A. Pharynx is perforated by gill slits. B. Notochord is absent. C. Central nervous system is dorsal. D. Heart is dorsal if present. E. Post anal tail is absent. Choose the most appropriate answer from the options given below:

1. A. A & C only
2. B. A, B & D only
3. C. B, D & E only
4. D. B, C & D only

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