Answer: B.
- A B
- B A
- C A ∪ B
- D A ∩ B
Correct answer: A. B
Explanation: A − B keeps the elements of A that do not belong to B.
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