Which of the following subsets of R are subspaces of RX2 A. The 3 x 3 matrices in reduced row-echelon form B. The 3 x 3 matrices of rank 2 C. The 3 x 3 matrices whose entries are all integers. D. The 3 x 3 matrices with trace 0 (the trace of a matrix is the sum of its diagonal entries) E. The 3 x 3 matrices with all zeros in the third row F. The 3 x 3 matrices A such that the vector 4. is in the kernel of A 6. 口口

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