Compute the product using the methods below. If a product is undefined, explain why.ponding entries in . The definition where Ax is the linear combination of the columns of A

using the corresponding entries in x as weights. b. The row-vector rule for computing Ax. a. Set up the linear combination of the columns of A using the corresponding entries in x as weights. Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. The matrix-vector Ax is not defined because the number of columns in matrix A does not match the number of entries l NU r of entries in the vector x The matrix-vector Ax is not defined because the number of rows in matrix A does not match the number of entries in the vector x.