Decide, among the following sets, which ...

Decide, among the following sets, which sets are subsets of one and another:
A = { `x : x ∈ R and x` satisfy `x^(2) – 8x + 12 = 0` },
`B = { 2, 4, 6 }, C = { 2, 4, 6, 8, . . . }, D = { 6 }`.

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The correct Answer is:

`A ⊂ B, A ⊂ C, B ⊂ C, D ⊂ A, D ⊂ B, D ⊂ C`

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