Determine if the matrix below is invertible. Use as few calculations as possible. Justify your answer. Choose the correct answer below. A. The matrix is not invertible. If the given matrix is A, the equation Axb has no solution for at least one b in . B. The matrix is not invertible. In the given matrix the columns do not form a linearly independent set. C. The matrix is invertible. The given matrix has 4 pivot positions. D. The matrix is invertible. The given matrix is not row equivalent to the nn identity matrix.