Which of the following is the correct form of the partial tion decomposition of x-1/x³x²?
a. A/x + B/x² + C/x³ + D/x² + E/x + F
b. A/x + B/x² + C/x³
c. A/x³ + B/x³ + C/x + D
d. A/x² + B/x³ + C/x + D