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(D) Let $A, B, C$ be subsets of a universal set $U$.$1$. Reflexivity: For every set $A$,$A \subseteq A$ is true. Thus,the relation '$\subseteq$' is re

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None of these

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(D) Let $A, B, C$ be subsets of a universal set $U$.$1$. Reflexivity: For every set $A$,$A \subseteq A$ is true. Thus,the relation '$\subseteq$' is reflexive.$2$. Symmetry: If $A \subseteq B$,it is not necessarily true that $B \subseteq A$ (for example,if $A = \{1\}$ and $B = \{1, 2\}$,then $A \subseteq B$ but $B 
ot\subseteq A$). Thus,the relation '$\subseteq$' is not symmetric.$3$. Transitivity: If $A \subseteq B$ and $B \subseteq C$,then $A \subseteq C$. Thus,the relation '$\subseteq$' is transitive.Therefore,the relation '$\subseteq$' is reflexive and transitive,but not symmetric. Since it is not symmetric,it is not an equivalence relation. The correct option is $(D)$.

With reference to a universal set,the inclusion relation $(\subseteq)$ of a subset in another is:

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