A must be true, B must not be true, and C may not be true.
Let A and B be compatible relations on the set A, then the following are incompatible relations: (c) Strictly speaking, they should intersect and are not necessarily compatible.
Answer a.a c ∪ b c
Compatibility: reflexivity and symmetry
How to calculate the ∩∩ between relationships?
When the relationship is represented by a set of binary combinations, it is enough to find the union and intersection.