#include &lt;stdio.h&gt;    int main&#40;&#41;    &#123;        char i = '9';        if &#40;isdigit&#40;i&#41;&#41;            printf&#40;&quot;digit\n&quot;&#41;;        else            printf&#40;&quot;not digit\n&quot;&#41;;            return 0;    &#125;
A. digit
B. not digit
C. Depends on the compiler
D. None of the mentioned
Answer:A
#include &lt;stdio.h&gt;    int main&#40;&#41;    &#123;        char i = '9';        if &#40;isdigit&#40;i&#41;&#41;            printf&#40;&quot;digit\n&quot;&#41;;        else            printf&#40;&quot;not digit\n&quot;&#41;;            return 0;    &#125;
A. digit B. not digit C. Depends on the compiler D. None of the mentioned