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Answer:
C
Step-by-step explanation:
[tex] (6^{-4} \times 8^{-7})^{-9} = [/tex]
[tex] = 6^{-4 \times (-9)} \times 8^{-7 \times (-9)} [/tex]
[tex] = 6^{36} \times 8^{63} [/tex]
Answer: C