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The system of equations \begin{aligned} &x+y+z=6 \\ &x+4 y+6 z=20 \\ &x+4 y+\lambda z=\mu \end{aligned} has NO solution for values of $\lambda$ and $\mu$ given by

1. $\lambda=6, \mu=20$
2. $\lambda=6, \mu \neq 20$
3. $\lambda \neq 6, \mu=20$
4. $\lambda \neq 6, \mu \neq 20$