Some group (G, 0) is known to be abelian. Then which one of the following is TRUE for G ?

• A. g = g2 for every g ∈ G
• B. g = g-1 for every g ∈ G
• C. G is of finite order
• D. (g o h) 2 = g2o h2 for every g,h ∈ G