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Write the complex number in standard form $a+bi$.

$$z=8\left[ \cos { \left( \frac { \pi }{ 2 } \right) } +i\sin { \left( \frac { \pi }{ 2 } \right) } \right]]$$

A

$-8i$

B

$4+4i\sqrt { 3 } $

C

$8i$

D

$-4-4i\sqrt { 3 } $

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