Will give brainliest and 40 points. the coordinates of the vertices of △def are d(−4, 1) , e(3, −1) , and f(−1, −4) . which statement correctly describes whether △def is a right triangle? a. △def is a right triangle because df is perpendicular to ef . b. △def is a right triangle because de is perpendicular to ef . c. △def is a right triangle because de is perpendicular to df . d. △def is not a right triangle because no two sides are perpendicular.