Final answer:
The cardinality of each empty set listed is zero, as the empty set contains no elements.
Step-by-step explanation:
The question asks about the cardinality of a set, which refers to the number of elements in the set. The symbol ∅ represents the empty set, which is a set that contains no elements. Since all the listed sets are empty sets, each has a cardinality of zero.
It's also noted that the terms such as 'A AND B' and 'A OR B' from the reference information pertain to operations on sets, where 'A AND B' refers to the intersection of sets A and B, which includes all elements that are in both sets, and 'A OR B' refers to the union of sets A and B, which includes all elements that are in either set.