Let G be an arbitrary group. Consider the following relations on G:R1: ∀a, b ϵ G, a R1b if and only if ∃g ϵ G such that a = g-1bgR2: ∀a, b ϵ G, a R1b if and only if a = b-1Which of the above is/are equivalence relation/relations?

• A. R1 and R2
• B. R1 only
• C. R2 only
• D. Neither R1 nor R2