Select the mathematical expression that is equivalent to the sum ∑_(n-4)^(j-2) j² + 7.
a) ∑_(n-4)^(j-2) j² + 7
b) ∑_(j-2)^(n-4) j² + 7
c) ∑_(n-4)^(j-2) n² + 7
d) ∑_(j-2)^(n-4) n² + 7