If a * b = a such that a ∗ (b ∗ c) = a ∗ b = a and (a * b) * c = a * b = a then ________

• A. * is associative
• B. * c = a * b = a then ________a) * is associativeb) * is commutative
• C. = a ∗ b = a and (a * b) * c = a * b = a then ________a) * is associativeb) * is commutativec) * is closure
• D. * is abelian