Multiple choice Choose the type(s) of cardinality of relationship for E-R modelling. One to one Many to one Both 1 and 2 No cardinality exists in an E-R model. None of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation An E-R diagram is a method to pictorially represent business findings. It has four types of cardinality of relationships - One to one, one to many, many to one and many to many.