Simplify: x−2⋅x5⋅x−1x^{-2} \cdot x^5 \cdot x^{-1}x−2⋅x5⋅x−1
x2x^2x2
x6x^6x6
1x2\frac{1}{x^2}x21
x−8x^{-8}x−8