Let \( R \) be the relation over the set of straight lines of a pla...

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Let \( R \) be the relation over the set of straight lines of a plane such that \( I_{1} R I_{2} \Leftrightarrow I_{1} \perp I_{2} \). Then, \( R \) is
(a) symmetric
(b) reflexive
(c) transitive
(d) an equivalence relation
\( \mathrm{P} \)
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