63. Circle O is the inscribed circle of △ ABC, intersecting the line segments AB , BC , AC at three points of P, Q and R, respectively. Given AB = 5 , BC = 6 , AC = 7 , which of the following is correct? (A) AP = 2 (B) BQ = 3 (C) The radius of circle O is 2 6 3 . (D) The area of △ ABC is 83.