please show step by step when separting the triangles!use law of cosines

2. In the triangle shown, angles ABD and DBC are 90°, AD = 15, DC =20, and AC = 25. D A С B What are the lengths BC and BD, respectively? (A) 12 and 16 (B) 13 and 17 (C) 16 and 12 (D) 18 and 13