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If $\sqrt { -1 } =i$, which of the following expressions is equivalent to the expression:

$$\frac { 3+2i }{ 1-i } $$

$5$

$\cfrac { 13 }{ 2 } $

$5i$

$\cfrac { 1 }{ 2 } +\cfrac { 5 }{ 2 } i$

Undefined.