What happens at line 2?
```
1 string s = “math is fun!”;
2 int f = s.at(0)
3 int t = s.size();
4 int n = s.at(5);
5 int y = s.at(s.5);
```
A. The value of f is m.
B. The value of f is [] (empty set).
C. The program will not compile.
D. The program crashes when it runs.
A
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