If you define the swap function as follows:

template

void swap(T &var1, T &var2)

{

T temp = var1;

var1 = var2;

var2 = temp;

}

You can invoke swap using ______.

int v1 = 1; int v2 = 2; swap(v1, v2);

swap(1, 2)

int v1 = 1; int v2 = 2; swap(&v1, &v2);

int v1 = 1; double v2 = 2; swap(v1, v2);