In the equation (x - h)2 + (y- k)2 = /2, what do the variables h and k represent? O k is the x-coordinate and h is the y-coordinate of any point on the circle O k is the x-coordinate and h is the y-coordinate of the center of the circle O his the x-coordinate and k is the y-coordinate of any point on the circle O h is the x-coordinate and k is the y-coordinate of the center of the circle