Let T be an linear transformation from Rr to Rs. Let A be the matrix associated to T. Fill in the correct answer for each of the following situations. 1. The row-echelon form of A has a column corresponding to a free variable. 2. Two columns in the row-echelon form of A are not pivot columns. 3. The row-echelon form of A has no column corresponding to a free variable. 4. Every column in the row-echelon form of A is a pivot column. A. T is one-to-one B. T is not one-to-one C. There is not enough information to tell