question_answer

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)  \[i\]