What is the value of t after line 3?
```
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. 12
B. 11
C. -1
D. Crash. That’s not how you call size().
A
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