Which is the simplified form of (9c^-9)^-3

Given    (9c^-9)^-3

                                                         -9
I'd apply the exponent -3 to 9 and c      separately, obtaining:

   -3         -9    -3
9      * [ c      ]

...which is best written as:

  1            1
*
 9^3       c^27

Please note:  you were to share the 4 possible answers.  Do that now, please.