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Select all the expressions that are equivalent to $(8^{-3})^1$.$\newline$Multi-select Choices:$\newline$(A) $\frac{1}{8^3}$$\newline$(B) $\frac{1}{8^{-3}}$$\newline$(C) $8^{-2}$$\newline$(D) $\frac{1}{8^{-2}}$