Show the output of the following code
```
public class Test1 {
public static void main(String[] args) {
System.out.println(f2(2, 0));
}
public static int f2(int n, int result) {
if (n == 0)
return 0;
else
return f2(n - 1, n + result);
}
}
```
a. 0
b. 1
c. 2
d. 3
a. 0
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