(1 point) Which of the following sets are subspaces of R37 A. {(2, y, 2) | 5x + 6y + 4z = -7} B. {(2, y, c) | 3.1 - 8y – 2z = 0} c. {(77 - 4y, -5x - Oy, - 6x +9y) | 2, y arbitrary numbers } D. {(x, y, z) x,y,z >0} E. {(2,0,0) | x arbitrary number} F. {(2,2-3,1-8) | 2 arbitrary number}