When an entity instance must be a member of only one sub-type, it is which of the following?
A. Disjoint with total specialization
B. Disjoint with partial specialization
C. Overlap with total specialization
D. Overlap with partial specialization
Answer:A
When an entity instance must be a member of only one sub-type, it is which of the following?
A. Disjoint with total specialization B. Disjoint with partial specialization C. Overlap with total specialization D. Overlap with partial specialization
Explanation: GradStudent (_id_, name, gradStuff) UndergradStudent (_id_, name, underGradStuff) Professor (_id_, name) Teaches(_prof_id_, _stud_id_)