The answer should be fully explained.

7. (20 points) Mark each statement as True or False. Justify. (a) The columns of an n x n invertible matrix can be linearly dependent. (b) If A is a 3 x 2 matrix, then the transformation 7(x) = Ax cannot be one-to-one. (c) If A is invertible, then mill(A) = {0}. (d) If A and B are two matrices such that AB = I, then BA = I. (e) If A is an invertible n x n matrix, then the columns of A span R&quot