Which of the following expressions is not equal to p^2?
AP^-3 P^5 P^-2 P^2
BP^-9 P^0 P^2 P^5
CP^-3 P^-1 P P^5
DP^-5 P^9 P^-2 P^0
AP^-3 P^5 P^-2 P^2
BP^-9 P^0 P^2 P^5
CP^-3 P^-1 P P^5
DP^-5 P^9 P^-2 P^0