What does the ungetc function return for the following C expression?

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answerhappygod
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What does the ungetc function return for the following C expression?

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ungetc(c, fp);//where declarations are int c and FILE *fp
a) It returns character c
b) It returns EOF for an error
c) Both returns character c and returns EOF for an error
d) Either returns character c or returns EOF for an error
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