Answer: singleton set.
- A singleton set
- B empty set
- C power set
- D universal set
Correct answer: A. singleton set
Explanation: A singleton set contains precisely one element.
A Venn diagram makes set identities visual: A∪B is everything inside either circle, A∩B is only the overlap, and the region outside both circles represents the complement of their union - directly illustrating De Morgan's law (A∪B)′ = A′∩B′.
Concept context
Types of sets, operations (union/intersection/complement), relations, and types of functions with domain and range