Consider the two E-R diagrams in Figure 2-25, which represent a database of community service agencies and volunteers in two different cities (A and B). For each of the following three questions, place a check mark under City A, City B, or Can't Tell for the choice that is the best answer.

Figure 2-25

City A City B Can't Tell a. Which city maintains data about only those volunteers who currently assist agencies? b. In which city would it be possible for a volunteer to assist more than one agency? c. In which city would it be possible for a volunteer to change which agency or agencies he or she assists? City A City B Assists Assists AGENCY 0VOLUNTEER AGENCY 0VOLUNTEER