Use the equation ( -a₂ + a₁ + 2a₃ = 0 ) to determine a nontrivial solution of ( Ax = 0 ).
a) ( a₁ = 1, a₂ = 0, a₃ = 1 )
b) ( a₁ = 0, a₂ = 2, a₃ = -1 )
c) ( a₁ = -2, a₂ = 1, a₃ = 0 )
d) ( a₁ = 1, a₂ = 2, a₃ = -1 )