Which line in the following program contains the prototype showDub function?
```
1 #include
2 using namespace std;
3 void showDub(int);
4 int main()
5 {
6 int x = 2;
7 showDub(x);
8 cout << x << endl;
9 return 0;
10 }
11 void showDub(int num)
12 {
13 cout << (num * 2) << endl;
14 }
```
a. line 3
b. line 4
c. line 7
d. line 11
a. line 3
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