Points A, B, C, and D lie on circle M. Line segment BD is a diameter. Triangle A C D is inscribed within circle M. Point B is on the circle between points C and B. A line is drawn to connect points D and B. Lines are drawn from points C and A to point M to form a right triangle. Arcs C D and A D are congruent. What is the measure of angle ACD? 45.0° 67.5° 112.5° 135.0°