This is just a practice test I found online to prepare for a class that starts on the 27th. Most of the questions I can find on google but this one has stumped me.

The expression !isdigit(ch) evaluates to nonzero if ch is ________.

A) an alphabetic character

B) 9

C) &

D) both A and C

E) None of the above
nvm figured it out.
Do you know what isdigit() does with its argument? And what it returns?
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