Suppose that A, B, C, D, and E are matrices with the following sizes: A B C D E (5 X 2) (5 X 7) (7X 1) (1X7) (2X5) Determine whether the matrix expression AE is defined. Enter the size of the resulting matrix (enter 'NA' in each box if undefined). AE is a ( X eTextbook and Media Save for Later Attempts: 0 of 3 used Submit