If $i{z^4} + 1 = 0$,then $z$ can take the value

  • A
    $\frac{1 + i}{\sqrt{2}}$
  • B
    $\cos \frac{\pi}{8} + i \sin \frac{\pi}{8}$
  • C
    $\frac{1}{4i}$
  • D
    $i$

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