Can each vector in R4 be written as a linear combination of the columns of the matrix A? Do the columns of A span R4?

Matrix A:
8 2 4 -1
-1 -1 -1 -6
0 - 15 - 1 12
0 2 -3 8

Can each vector in R4 be written as a linear combination of the columns of the matrix A? Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or decimal for each matrix element.)

A. No, because the reduced row echelon form of A is
B. Yes, because the reduced row echelon form of A is