Multiple-select QuestionWhen dealing with 1-to-1 relationship:

	A.	You need to understand mandatory/optional participations to decide which is the parent and which is the child entity
	B.	If they are both mandatory, you can create 2 relations, one for each entity, and put a copy of the PK of one relation to the other as a FK
	C.	If one is mandatory and the other optional, the entity with optional participation is the parent
	D.	You need to decide which is the parent and which is the child by looking at the entities attributes