D’Neese said that 1/10^5 is equivalent to 10^5 . Which statement is true about what D’Neese said?

D’Neese is correct because a^-n =1/a^n
D’Neese is correct because a^-n = 1//a^-n
D’Neese is incorrect because a^-n = -1/a^n
D’Neese is incorrect because a^-n = a/-n