Which one of the following relations on \( R \) is an equivalence r...

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Which one of the following relations on \( R \) is an equivalence relation?
a) \( a R_{1} b \Leftrightarrow|a|=|b| \)
b) \( a R_{2} b \Leftrightarrow a \geq b \)
C) \( a R_{3} b \Leftrightarrow a \) divides \( b \)
d) \( a R_{4} b \Longleftrightarrow ab \)
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