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Let `A_(1)`, `A_(2)` and `A_(3)` be subsets of a set `X`. Which one of the following is correct ?

A

`A_(1)uuA_(2)uuA_(3)` is the smallest subset of `X` containing elements of each of `A_(1)`, `A_(2)` and `A_(3)`

B

`A_(1)uuA_(2)uuA_(3)` is the smallest subset of `X` containing elements either `A_(1)` or `A_(2)uuA_(3)` but not both

C

The smallest subset of `X` containing `A_(1)uuA_(2)` and `A_(3)` equals the smallest subset of `X` containing both `A_(1)` and `A_(2)uuA_(3)` only if `A_(2)=A_(3)`

D

None of these

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A
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