Given the following function definitions and program fragments, what is the output?

void f1(int& z, int &q)
{
int temp;
temp=q;
q=z;
z=temp;
}

void f2( int& a, int& b)
{
if( a f1(a,b);
else
a=b;
}

int x=3, y=4;
f2(y,x);
cout << x <<" " << y << endl;

a. 3 3
b. 4 3
c. 3 4
d. 4 4

a. 3 3