Mohamed and Li Jing were asked to find an explicit formula for the sequence -5, -25, -125, -625, ... , where the first term should be g(1). Mohamed said the formula is g(n) = -5 * 5ⁿ, and Li Jing said the formula is g(n) = -5 * 5^(n-1). Which one of them is right?

a. Mohamed
b. Li Jing
c. Both are correct
d. None of the above