The following system of equations x1 + x2 + 2x3 =...

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The following system of equations
x₁ + x₂ + 2x₃ = 1
x₁ + 2x₃ + 3x₃ = 2
x₁ + 4x₂ + ax₃ = 4
has a unique solution. The only possible value(s) for a is/are

A. 0

B. either 0 or 1

C. one of 0, 1 or -1

D. any real number other than 5

Answer: Option D

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