What does the ungetc function return for the following C

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What does the ungetc function return for the following C expression?
```
ungetc(c, fp);//where declarations are int c and FILE *fp
```

1. Either returns character c or returns EOF for an error
2. It returns EOF for an error
3. It returns character c
4. Both returns EOF for an error and returns character c
5. None of these

Correct Option: A

Either returns character c or returns EOF for an error