Which of the following sets are subspaces of R³? A. {(x, y, z) |2x - 8y + 3z = 9}| □ B. {(−5, y, z) | y, z arbitrary numbers }| □ C. {(-9x, —2x, 8x) 1 x arbitrary number}| □ D. {(x, 0, 0) 1 x arbitrary number}| □ E. {(x, y, z) | - 5x + 4y +7z = 0}| □ F. {(x, y, z) | x

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