When modelling a 1-to-1 relationship and converting an ERD into a relational schema:

	A.	Optional participation can be used to understand which entity is the parent and which one is the child
	B.	Optional/mandatory participations are not important
	C.	If mandatory in both side we can create 3 tables, one for the relationship and 2 for the entities
	D.	We should look at the number of attributes that the entities have