Which one of the following relations on R is an equivalence relation

1.	Which one of the following relations on R is an equivalence relation
A.	\[a\,{{R}_{1}}\,b\Leftrightarrow \|a\|=\|b\|\]
B.	\[a{{R}_{2}}b\Leftrightarrow a\ge b\]
C.	\[a{{R}_{3}}b\Leftrightarrow a\text{ divides }b\]
D.	\[a{{R}_{4}}b\Leftrightarrow a<b\]
Answer» B. \[a{{R}_{2}}b\Leftrightarrow a\ge b\]

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Which one of the following relations on R is an equivalence relation

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