Consider the linear transformation T:R3R4 defined by T(x)=4x24x32x1+8x2+4x3x12x32x2+2x3=Ax. (a) is Tone-to-one, and why [Select] Yes, because the columns of A are linearly independent. No, because A does not have a pivot position in every row. (b) Does T maps R3 onto R4 Yes, because A has a pivot position in every row. Yes, because A has a pivot position in every column. No, because the columns of A are linearly dependent