Which ordered triple is a solution of this system?

2x + y - z = 7

-x - 2y + 4z = - 15

x + 2y - 5z = 17

a) (3, 1, 0)

b) (1, 3, - 2)

c) (2, 5, 2)

d) (-2, 6, - 5)

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Which solid figure has one polygon base