Select all the correct statements about the following EER diagram. PMF Person Mother Father If p is a person and f is a father then it is possible that PMF contains p,f,f If p1,p2 are different persons, f is a father and m is a mother then PMF cannot contain both p1,m,f and p2,m,f Every father must participate in PMF If the set Person is nonempty then also the set Other must be nonempty It is possible that some persons do not participate in PMF If the set Mother is nonempty then also the set Father must be nonempty There can be mothers that do not participate in PMF