10. A specialization can be mapped to the relational model as: i) a single table ii) one table for each "subclass", and each of those tables includes all "superclass" attributes iii) one table for each "subclass", plus one table for the superclass a) (7 points) Which of those representations work for disjoint specializations, and which for overlapping specializations? Explain b) (8 points) Which of those representations work for mandatory specializations, and which for optional specializations? Would a modified description work? Explain. c) (10 points) What type query returns all records combined for each of those representations? Make sure to be specific. List them from slowest to fastest. d) (5 points) Which representation is least favorable when subclasses have many distinctive attributes?