Determine if the specified linear transformation is (a) one-to-one and (b) onto. Justify each answer. Upper T (x 1 comma x 2 comma x 3 )equals (x 1 minus 7 x 2 plus 4 x 3 comma x 2 minus 5 x 3 )(a) Is the linear transformation one-to-one? A. T is not one-to-one because the columns of the standard matrix A are linearly dependent. B. T is one-to-one because T(x)equals0 has only the trivial solution.