b. When a proper rational function has factor of (x - 4)" in the denominator, which of the following should appear in its partial fraction decomposition? Choose the correct answer below. AX + BX + C O A. (x- 4)3 A1 A2x A3x 2 + B2x O B. (x - 4)' (x - 4)2' ( x - 4) 3 A1 A2x + By A3 x 2 + Box + C OC. (x - 4)' ( x - 4)2 ( x - 4) 3 A2 A3 OD. (x -4)' ( x- 4)2' (x- 4)3