Of the Products AB, BA, A² and B², Which Ones $A = \left[ \begin{array} { c } - 3 \\1 \\- 7\end{array} \right] , B = \left[ \begin{array} { l l l } 7 & 1 & 6\end{array} \right]$

Multiple Choice

Of the products AB, BA, A² and B², which ones are possible for the given matrices? $A = \left[ \begin{array} { c } - 3 \\1 \\- 7\end{array} \right] , B = \left[ \begin{array} { l l l } 7 & 1 & 6\end{array} \right]$

A) B² only
B) A² only
C) BA only
D) AB only
E) AB and BA only