Find the slope of the line that is (a) parallel and (b) perpendicular to the line through the pair of points. (-1,3) and (0,0) (a) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The slope of the parallel line is - 3.(Type an integer or a simplified fraction.) B. The slope of the parallel line is undefined. (b) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. The slope of the perpendicular line is undefined. OB. The slope of the perpendicular line is (Type an integer or a simplified fraction.)