Simplify the expression ((p^(-3)q3)/(r^(-6)))^(-2). Which of the following is the simplified form?
A. (p^6q^(-6))/(r^12)
B. (p^(-6)q^(-6))/(r^12)
C. (p^6q^6)/(r^(-12))
D. (p^(-6)q^6)/(r^(-12))