check if my answer is correct please. question on software testing

Consider the method intersection() below, along with two characteristics: public static Set intersection (Set s1, Set s2) * Oparam s1, s2 : sets to compute intersection of * Oreturn a (non nu11) Set equal to the intersection of Sets s1 and s 2 Nul1PointerException if s1 or s2 is null */ Characteristic: Type of s1 - s1 = null - s1 = \{\} - s1 has at least one element Characteristic: Relation between s1 and s2 s1 and s2 represent the same set s1 is a subset of s2 s2 is a subset of s1 s1 and s2 do not have any elements in common - Does the partition "Type of s1" satisfy the completeness property? If not, give a value for s1 that does not fit in any block. - Does the partition "Type of s1" satisfy the disjointness property? If not, give a value for sl that fits in more than one block. - If necessary, fix "Type of s1. - Does the partition "Relation between s1 and s2" satisfy the completeness property? If not, give a pair of values for s1 and s2 that does not fit in any block. - Does the partition "Relation between s1 and s2 satisfy the disjointness property? If not, give a pair