The number of attendant entities of a relationship represents the degree of the corresponding relationship. If there are two participated entities in a relationship type, that relationship is referred as binary relationship. A ternary relationship has three participants whereas n-ary relationship has n participants. For a binary relationship, cardinality ratio can be one of the following options: one-to-one (1:1), one-to-many (1:N), many-to-one (N:1) and many-to-many (N:M). Two types of participation constraints exist. If every entity in an entity set is participated in the relationship type then the participation for corresponding entity type is total. If there are some entities of an entity type which do not participate in the relationship type, then that entity type is partially participated. Therefore, the correct option is E.