Considere as matrizes !$ A = { \begin{bmatrix}1\,\,\,\,\,\,a\\2\,\,\,-1 \end{bmatrix}}, B= { \begin{bmatrix}1\,\,\,\,\,\,b\\b\,\,\,\,1 \end{bmatrix}} !$ e !$ C = { \begin{bmatrix}cos\,\theta\,\,\,\,\,\,sen\,\theta\\-sen\,\theta\,\,\,cos\,\theta \end{bmatrix}} !$. Julgue a afirmativa:

Item 0 - Para a = 1 e b = 2, então !$ ( 3A - B^t)^t = { \begin{bmatrix}2\,\,\,\,\,\,1\\4\,\,\,-4 \end{bmatrix}} !$