If $'a'$ is non real complex number for which system of equations $ax -a^2y + a^3z$ = $0$ , $-a^2x + a^3y + az$ = $0$ and $a^3x + ay -a^2z$ = $0$ has non trivial solutions, then $|a|$ is 

  • A

    $0$

  • B

    $1$

  • C

    $\sqrt3 $

  • D

    $2$

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