Consider two vectors v₁,v₂ in ℝ² such that v₁=[[1+x],[x]], and v₂=[[2+x],[x]], where x ∈ ℝ. What is the necessary and sufficient condition for v₁ and v₂ being linearly independent?
a) x ≠ 0
b) x ≠ 1
c) x = 0
d) x = 1