Question 1204e

Select all options that apply: ${\mathbf{a}=\mathbf{0}}$ ${\mathbf{b}=\mathbf{0}}$ ${|\mathbf{a}|=|\mathbf{b}|}$ ${\mathbf{a}}$ is a unit vector ${\mathbf{b}}$ is a unit vector ${\mathbf{a}}$ is parallel to ${\mathbf{b}}$ ${\mathbf{a}}$ is perpendicular to ${\mathbf{b}}$