Determine if the columns of the matrix span R4. -14 -4 10-28 15 9 -12 39 18 30 -6 45 7 - 9 -2 -7 Select the correct choice below and fill in the answer box to complete your choice. ○ A. The columns do not span R4 because none of the columns of A are linear combinations of the other columns of A. B. The columns do not span R4 because the reduced echelon form of the augmented matrix is not have a pivot in every row. (Type an exact answer for each matrix element.) C. The columns span R4 because the reduced echelon form of the augmented matrix is every row. (Type an exact answer for each matrix element.) which does which has a pivot in D. The columns span R4 because at least of the columns of A is a linear combination of the other columns of A.

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