Lydia graphed ADEF at the coordinates D (-2, -1), E (-2, 2), and F (0,0). She thinks ADEF is a right triangle. Is Lydia's assertion correct? •Yes; the slopes of EF and DF are opposite reciprocals.

•Yes; the slopes of EF and DF are the same.

•No; the slopes of EF and DF are not opposite reciprocals.

•No; the slopes of EF. and DF are not the same.