Determine if the matrix below is invertible. Use as few calculations as possible. Justify your answer. -2 1 Choose the correct answer below. [ 4 -2]
[-2 1]
A. The matrix is invertible because its determinant is not zero
B. The matrix is not invertible because its determinant is zero.
C. The matrix is invertible because its columns are multiples of each other. The columns of the matrix form a linearly dependent set.
D. The matrix is not invertible because the matrix has 2 pivot positions