What is default value of enum C#?

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1. #represents
2. #whatever
3. #since
4. #value
5. #enumeration
6. #values
7. #without
8. #member
9. #specifically
10. #expression
11. #overriding
12. #returns
13. #default
14. #documentation
15. #occurring
16. #produced
17. #printing
18. #first
19. #element