A circle is described by the equation (x−1/2 )^2 +(y−3/2 )^2 =4/9 . What are the cordinates for the center of the circle and the length of the radius? A) (-1/2 ,-3/2 ) , 2/3 units B) (-1/2 ,-3/2 ) , 4/9 units C) (1/2 ,3/2 ) , 4/9 units D) (1/2 ,3/2 ) , 2/3 units