What is the output of the following code?

```
include
using namespace std;

class Foo
{
public:
int x; // data field
int y; // data field

Foo()
{
x = 10;
y = 10;
}

void p()
{
int x = 20; // local variable
cout << "x is " << x << " ";
cout << "y is " << y << endl;
}
};

int main()
{
Foo foo;
foo.p();

return 0;
}
```

a. x is 20 y is 20
b. x is 10 y is 10
c. x is 10 y is 20
d. x is 20 y is 10

d. x is 20 y is 10