If $a+bi = \frac{i}{1-i}$,then $(a, b) =$

  • A
    $(\frac{-1}{2}, \frac{-1}{2})$
  • B
    $(\frac{1}{2}, \frac{1}{2})$
  • C
    $(\frac{1}{2}, \frac{-1}{2})$
  • D
    $(\frac{-1}{2}, \frac{1}{2})$

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