Rank the options below. Using the definition of intersection, x A A x B B . Using the definition of intersection, x x . open choices for ranking 6 Therefore, we get x AB AB AB AB . Therefore, we get x . open choices for ranking 5 Applying De Morgan's law of proposition, we get (x A x B). Applying De Morgan's law of proposition, we get (x A x B). open choices for ranking 3 Consider x AB AB . Consider x . open choices for ranking 4 Using the definition of the complement of a set, x A x B. Using the definition of the complement of a set, x A x B. open choices for ranking 1 Then, we can write (x A) (x B). Then, we can write (x A) (x B). open choices for ranking 2 Hence, AB AB is true. Hence, is true. open choices for ranking 7