Does Class D airspace need Mode C?

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Tags

1. #requirements
2. #required
3. #clearance
4. #other
5. #entering
6. #conditions
7. #before
8. #communication
9. #reverts
10. #airspace
11. #hours
12. #during
13. #special
14. #class
15. #tower
16. #cloud
17. #transponder
18. #closed
19. #visibility
20. #under
21. #established