When the position vector r =x i +y j +z k changes sign as - r, which one of the following vector will not flip under sign change?

When the position vector $\displaystyle \vec{r}=x \hat{i}+y \hat{j}+z \hat{k}$ changes sign as $\displaystyle -\vec{r}$, which one of the following vector will not flip under sign change ?