Without doing any row operations, explain why the following system of linear equations is consistent.
A. 2X₁ + 3X₂ + 5x₃ + 5x₄=0
B. -5x₁+ 6x₂ -17x₃ - 2x₄=0
C. 7x₁ -4x₂ + 3x₃ + x₄=0