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If $A =\left[\begin{array}{cc}1 & 2 \\ -3 & -1\end{array}\right], B =\left[\begin{array}{rr}-1 & 0 \\ 1 & 5\end{array}\right]$ then $AB =$

• A
  $\left[\begin{array}{rr}1 & -10 \\ 1 & 20\end{array}\right]$
• B
  $\left[\begin{array}{rr}1 & 10 \\ -1 & 20\end{array}\right]$
• ✓
  $\left[\begin{array}{ll}1 & 10 \\ 1 & 20\end{array}\right]$
• D
  $\left[\begin{array}{rr}1 & 10 \\ -1 & -20\end{array}\right]$