3. (40 pt.) Consider the following five relations: (a) Relation s (less than or equal) on the set Z of integers. (b) Set inclusion on a collection C of sets. (c) Relation L (perpendicular) on the set L of lines in the plane. (d) ll(parallel) on the set L of lines in the plane. (e) Relation | of divisibility on the set N of positive integers. Determine which relations are reflexive