If momentum (P), area (A), and time (T) are taken to be fundamental quantities, then energy has the dimensional formula
a) P^{1}A^{-1}T^{1}
b) P^{2}A^{1}T^{1}
c) P^{1}A^{-1/2}T^{1}
d) P^{1}A^{1/2}T^{-1}