Utilizing a software tool of your own choosing, such as MATLAB or Wolfram Alpha$/$Mathematica$/$Maple$,$ determine which one of the complex plane coordinates below belong in the Mandelbrot set.

$1-j$

$0\mathrm{.}3-1\mathrm{.}2j$

$-0\mathrm{.}1-0\mathrm{.}8j$

$2\mathrm{.}3+4\mathrm{.}7j$

$-0\mathrm{.}4+j$

$0\mathrm{.}5-0\mathrm{.}5j$

$0\mathrm{.}5+j$

$-0\mathrm{.}9-1\mathrm{.}3j$

$1$ donkey and $28$ chickens

$0\mathrm{.}7-0\mathrm{.}5j$