\( A=\{ \) ONGC, BHEL, SAIL, GAIL, IOCL \( \} \) and \( R \) is a relation defined as two elemen...

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\( A=\{ \) ONGC, BHEL, SAIL, GAIL, IOCL \( \} \) and \( R \) is a relation defined as two elements of \( A \) are related if they share exactly one common letter. For instance, BHEL and SAIL are related as they have a common letter \( L \). The relation \( R \) is
(a) anti-symmetric (b) only transitive
(c) only symmetric (d) equivalence
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