8. Let A={,,} and B={,,}. a. List the elements of AB (the parentheses and comma in an ordered pair are not necessary in cases such as this where the elements of each set are individ symbols): justification and answer: b. Identify the intersection of AB and BA for the case above: justification and answer: Guess at a general rule for the intersection of AB and BA, where A and B are any two sets. justification and