Which of the following subsets of R³x3 are subspaces of R³×32 A. The 3 x 3 matrices whose entries are all integers B. The 3 x 3 matrices whose entries are all greater than or equal to 0 C. The 3 x 3 matrices with all zeros in the second row OD. The invertible 3 x 3 matrices DE. The diagonal 3 x 3 matrices OF. The symmetric 3 x 3 matrices

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