Express the Indicated Roots of Unity in Standard Form a $1+0 \mathrm{i}$

Express the indicated roots of unity in standard form a + bi.
-Fourth roots of unity

A) $1+0 \mathrm{i}$
$$\begin{array}{l}\cos \frac{\pi}{4}+i \sin \frac{\pi}{4}=\frac{\sqrt{2}}{2}+\frac{\sqrt{2}}{2} i \\1-i \\0-i\end{array}$$
B) $1+0 i$
$\cos \frac{\pi}{2}+i \sin \frac{\pi}{2}=0+i$
$\cos \pi+i \sin \pi=-1+0 i$
$\cos \frac{3 \pi}{2}+i \sin \frac{3 \pi}{2}=0-i$
C) $1+0 i$
$\cos \frac{\pi}{4}+i \sin \frac{\pi}{4}=\frac{\sqrt{2}}{2}+\frac{\sqrt{2}}{2} i$
$\cos \frac{\pi}{2}+i \sin \frac{\pi}{2}=0+i$
$\cos \frac{3 \pi}{4}+i \sin \frac{3 \pi}{4}=-\frac{\sqrt{2}}{2}+\frac{\sqrt{2}}{2} i$
D) $1+0 \mathrm{i}$
$$\begin{array}{l}\cos \frac{\pi}{2}+i \sin \frac{\pi}{2}=0+i \\\cos \pi+i \sin \pi=-1+0 i \\1-i\end{array}$$