A

\[\frac{\vec{i}-\vec{j}}{\sqrt{2}}\]

B

\[\frac{\vec{i}+\vec{j}}{\sqrt{2}}\]

C

\[\frac{\vec{i}-2\vec{j}+\vec{k}}{\sqrt{3}}\]

D

\[\frac{\vec{i}+2\vec{j}}{\sqrt{3}}\]

E

\[\frac{\vec{i}-2\vec{j}-\vec{k}}{\sqrt{2}}\]