Which of the following subsets of R³x3 are subspaces of R³×³? A. The 3 x 3 matrices with all zeros in the third row B. The 3 x 3 matrices whose entries are all integers C. The symmetric 3 x 3 matrices D. The invertible 3 x 3 matrices E. The diagonal 3 x 3 matrices F. The 3 x 3 matrices with determinant 0

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