An alien living on a far-distant planet wishes to create a database that tracks members of the legislative body that makes laws for its planet. This legislative body is known as the Regress. All members of the Regress have a unique id number, first name, last name, and geographic affiliation. Some members of the Regress are overspenders, others are obstructionists, and some are both of these things at the same time. However, there is no member of the Regress who is neither an obstructionist nor an overspender. For obstructionists, we want to track their longest filibuster and number of self-contradictions. For overspenders, we want to track the amount of spending they have proposed and the name of the imaginary money-printing fairy in which they believe.

Which of the following is true about the ERD that would depict these requirements?

a. The word "Optional" will appear on this diagram b. The disjoint constrant is an "Or" C. There is no need to show subclasses for these requirements d. The word "Mandatory" will appear on this diagram