Question: #include char ch; ifstream in_file; in_file.open(c:File.txt); while (in_file.get(ch)) { if (isupper(ch)) cout < < ch; } return 0; } What is the output of the

#include 
char ch;
 ifstream in_file;
 in_file.open("c:\\File.txt");
 while (in_file.get(ch))
 {
 if (isupper(ch))
 cout << ch;
 }
 return 0;
}

What is the output of the program if File.txt contains the text "Four And 20"?

Won't compile because of unknown function "isupper()".

A. Won't compile because of unknown function "isupper()"

B. F

C. FA

D. Four And 20

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