Property A is the left set. Property B is the right set. The intersection is where an element has both properties. Property A: One can walk Property B: One can chew gum Intersection: one can walk and chew gum "Smart people can walk and chew gum" (at the same time, that is) is a well-worn saying. A corollary is that "the DUMB ONES can ONLY walk OR chew gum, but NOT BOTH AT ONCE". The diagram above illustrates these sayings, as does a set of JOIN diagrams in this exam. Select the code that corresponds to the DUMB ONES