Which of the following subsets of R³X3 are subspaces of R³×3? 2 -0-8 B. The 3 x 3 matrices with all zeros in the first row C. The 3 x 3 matrices in reduced row-echelon form D. The 3 x 3 matrices with determinant 0 E. The invertible 3 x 3 matrices F. The diagonal 3 x 3 matrices A. The 3 x 3 matrices A such that A 6

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