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Which of the following is equivalent to the rational expression:

$$ \frac { { b }^{ 2 }-ab }{ a-b } $$

...where $ a\neq b $?

A

$b$

B

$-b$

C

$ { b }^{ 2 } $

D

$ { b }^{ 2 }-1 $

E

$0$

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