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(C) Let $S$ be a power set. For any set $A \in S$,we know that $A \subseteq A$. Therefore,the relation '$\subseteq$' is reflexive.If $A \subseteq B$ a

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Reflexive

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(C) Let $S$ be a power set. For any set $A \in S$,we know that $A \subseteq A$. Therefore,the relation '$\subseteq$' is reflexive.If $A \subseteq B$ and $B \subseteq C$,then $A \subseteq C$. Therefore,the relation '$\subseteq$' is transitive.However,if $A \subseteq B$,it does not necessarily imply that $B \subseteq A$ (unless $A = B$). Therefore,the relation '$\subseteq$' is not symmetric.Since the relation is reflexive and transitive but not symmetric,it is not an equivalence relation. Thus,the correct property is that it is reflexive.

In the context of a power set containing a subset,the relation 'is a subset of' $(\subseteq)$ is:

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