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Factoring an expression

Factor he expression
 
-216x^3+1
 
A. (-6x+1)(36x^2+6x+1)
 
B. (-6x+1)^3
 
C. (-6x-1)(36x^2-6x+1)
 
D. prime polynomial
 
I know the problem is not a prime polynomial. I came up with -(6x-1)(36x^2+6x+1). This answer is not listed, What did I do wrong.
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