A binary operation * is defined over the set of real numbers such taht m*n = m + n + 2 and m.n = m - n + 1. Which of the following equations is not true?

• A.a * (b * c) = (a * b) * c
• B.a * (b * c) = (a * c) * b
• C.a . (b . c) = (a . b) . c
• D.a * (b . c) = (a * b) . c