please please solve this question perfectly and urgently. And make sure answer is correct

1. Select from the following statements those that are true and leave unselected those that are false. A basis for the column space for a matrix A is obtained by selecting the columns of a row equivalent matrix U in echelon form that have leading ones in them. The dimension of the nullspace of a matrix A equals the number of columns in a row equivalent matrix U that don't have leading ones in them. A square matrix that has linearly independent columns will also have linearly independent rows. The dimension of the row space of matrix may not equal the dimension of the column space of that same matrix. A basis for the row space of a matrix Acan be obtained by finding an echelon form Uof the matrix and selecting the rows from U that have O leading ones in them