Determine Whether or Not the Pair of Matrices Is an Inverse

Multiple Choice

Determine whether or not the pair of matrices is an inverse pair. $\left[ \begin{array} { l l l } 2 & 2 & 2 \\0 & 2 & 2 \\0 & 0 & 2\end{array} \right]$ , $\left[ \begin{array} { c c c } - \frac { 1 } { 2 } & \frac { 1 } { 2 } & 0 \\0 & - \frac { 1 } { 2 } & \frac { 1 } { 2 } \\0 & 0 & - \frac { 1 } { 2 }\end{array} \right]$

A) inverse
B) not inverse