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The following expression can be substituted for. if (isalpha(c) && isdigit(c)) a) if...
The following expression can be substituted for.

if (isalpha(c) && isdigit(c))

a) if (isalnum(c))

b) if (isalphanum(c))

c) if (isalphanumeric(c))

d) None of the mentioned

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