Perform the indicated operation and simplify.

$fraction numerator 3 over denominator x squared minus 9 end fraction plus fraction numerator 3 over denominator x squared minus 6 x plus 9 end fraction minus fraction numerator 1 over denominator x plus 3 end fraction$

A. $fraction numerator minus x squared minus 12 x plus 9 over denominator x to the power of 4 minus 6 x cubed plus 54 x minus 81 end fraction$

B. $fraction numerator minus x squared minus 12 x space plus space 9 over denominator x cubed minus 3 x squared minus 9 x plus 27 end fraction$

C. $fraction numerator minus x squared plus 12 x minus 9 over denominator x to the power of 4 minus 6 x cubed plus 54 x minus 81 end fraction$

D. $fraction numerator minus x squared plus 12 x minus 9 over denominator x cubed minus 3 x squared minus 9 x plus 27 end fraction$