(Solved): Determine whether BC is defined. If it is defined, express the result as a single matrix, if it ...

Determine whether $BC$ is defined. If it is defined, express the result as a single matrix, if it is not, say "not def $A=\left[\begin{array}{rrr}0& 2& -2\\ 1& 5& 6\end{array}\right],B=\left[\begin{array}{rrr}4& 1& 0\\ -4& 1& -2\end{array}\right],C=\left[\begin{array}{rr}5& 1\\ 3& 1\\ -6& 3\end{array}\right]$ Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The expression $BC$ is defined. $BC=$ B. The expression BC is not defined.