Final answer:
The given set A = {y/y ∈ N, y<1} is an example of an Empty Set in Mathematics.
Step-by-step explanation:
The given set A = {y/y ∈ N, y<1} represents a set of natural numbers (N) that are less than 1. Since there are no natural numbers that are less than 1, the set is empty. Therefore, the correct option is A. Empty Set.