(8x9 / 27y-6)-2/3 = ?

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Question 1:

(8x⁹ / 27y^-6)^-2/3 = ?

A. 9/4 x^-6 y^-4

Feedback (8x⁹ / 27y^-6)^-2/3 = (8x⁹y⁶ / 27)^-2/3 = [(2/3 x³ y²)³]^-2/3

= 9/4 x^-6 y^-4.

B. 9/4 x^-4 y^-6

C. 9/4 x^-6 y⁴

D. 9/4 x^-4 y⁶

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