What is the transpose of a 2×22 \times 22×2 matrix A=(abcd)A = \begin{pmatrix} a & b \\ c & d \end{pmatrix}A=(acbd)?
(acbd)\begin{pmatrix} a & c \\ b & d \end{pmatrix}(abcd)
(abcd)\begin{pmatrix} a & b \\ c & d \end{pmatrix}(acbd)
(dcba)\begin{pmatrix} d & c \\ b & a \end{pmatrix}(dbca)
(badc)\begin{pmatrix} b & a \\ d & c \end{pmatrix}(bdac)