Which expression is equivalent to (82)−4?

1 over 8 to the 2nd
negative 1 over 8 times 8 times 8 times 8 times 8 times 8 times 8 times 8
1 over 8 times 8 times 8 times 8 times 8 times 8 times 8 times 8
8 to the 2nd