What is the printout of the following code?
```
#include
using namespace std;
void f(int &p1, int p2)
{
p1++;
p2++;
}
int main()
{
int x1 = 1;
int x2 = 1;
f(x1, x2);
cout << "x1 is " << x1 << " x2 is " << x2;
}
```
a. x1 is 2 x2 is 2
b. x1 is 1 x2 is 2
c. x1 is 1 x2 is 1
d. x1 is 2 x2 is 1
d. x1 is 2 x2 is 1
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