Which expression is equivalent to (82)−4?

A- 1 over 8 to the 2nd
B-negative 1 over 8 times 8 times 8 times 8 times 8 times 8 times 8 times 8
C-1 over 8 times 8 times 8 times 8 times 8 times 8 times 8 times 8
D-8 to the second power