What is the output of the following code?
```
#include
using namespace std;
void f(double &p)
{
p += 2;
}
int main()
{
double x = 1;
double y = 1;
f(x);
f(y);
cout << "x is " << x;
cout << " y is " << y << endl;
return 0;
}
```
A. x is 2 y is 2
B. x is 1 y is 1
C. x is 1 y is 2
D. x is 3 y is 3
E. x is 2 y is 1
D. x is 3 y is 3
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