Need help solving Matrix question

[themonsoonkid]

What would be the values of a 3*1 matrix for which Ax = 1x, where

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A= (1 2 -1)
   (1 0   1)
   (4 -4 5)


Options

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A. -k          B. k           C. -k         D. k
    k             2k              k            2k
    2k            k               k            -k


[nona.m.nona]

What did you get when you multiplied each column vector by A?