$(2, 4, 6)$ is normal; the unit normal is $\frac{1}{\sqrt{14}}(1, 2, 3)$

$(1, 2, 3)$ is normal; the unit normal is $\frac{1}{\sqrt{14}}(1, 2, 3)$

$(3, 2, 1)$ is normal; the unit normal is $\frac{1}{\sqrt{14}}(3, 2, 1)$

$(2, 2, 3)$ is normal; the unit normal is $\frac{1}{\sqrt{17}}(2, 2, 3)$