100 points!

which of these exponents don't belong? the problem is typed out below. i don't ask questions often so your effort will be greatly appreciated today. 100pts and a brainliest answer will be given to whoever has the most concise or clear and elaborate answer. you for your and have a blessed day.

q) which exponent doesn't belong? why? remember to include what your answer is, how you got that answer, why you chose the strategy you chose, and why your answer is correct. the more the better! * you once again.
1) positive base with positive exponent: 5^2
2) positive base with negative exponent: (5)^-2
3) negative base with positive exponent: (-5)^2
4) negative base with negative exponent: (-5)^-2