If $z$ is a complex number such that $| z | = 4$ and $arg \,(z) = \frac {5\pi }{6}$ , then $z$ is equal to

  • A

    $ - 2\sqrt 3  + 2i$

  • B

    $2\sqrt 3  + i$

  • C

    $2\sqrt 3  - 2i$

  • D

    $ - \sqrt 3  + i$

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