What is the product of a 1×21 \times 21×2 matrix A=(32)A = \begin{pmatrix} 3 & 2 \end{pmatrix}A=(32) and a 2×12 \times 12×1 matrix B=(45)B = \begin{pmatrix} 4 \\ 5 \end{pmatrix}B=(45)?
222222
(1210)\begin{pmatrix} 12 & 10 \end{pmatrix}(1210)
(1210)\begin{pmatrix} 12 \\ 10 \end{pmatrix}(1210)
777