Which is true about isupper(ch), where ch is an int that

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Which is true about isupper(ch), where ch is an int that can be represented as an unsigned?
```
char or EOF.isupper(ch) returns
```

1. 0 if ch is not upper case
2. Non-zero if ch is upper case
3. Both 0 if ch is not upper case & Non-zero if ch is upper case
4. Nothing
5. None of these

Correct Option: C

Both 0 if ch is not upper case & Non-zero if ch is upper case