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The expression [a^9 6 3]^4[a^9 3 6]^4 is...

The expression `[a^9 6 3]^4[a^9 3 6]^4` is simplified to `a^(16)` b. `a^(12)` c. `a^8` d. `a^4`

A

`a^(16)`

B

`a^(12)`

C

`a^(8)`

D

`a^(4)`

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