Decide among the following sets, which are subsets of which: \[ A=\left\{x: x \text { satisfies ...

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Decide among the following sets, which are subsets of which:
\[
A=\left\{x: x \text { satisfies } x^{2}-8 x+12=0\right\}, B=\{2,4,6\}, C=\{2,4,6,8, \ldots\}, D=\{6\}
\]
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