The following ER diagram defines
1
An entity A can be associated with at-most one entity of B and an entity B can be associated with at-most one entity of A.
2
An entity B can be associated with at-least one entity of A and an entity A can be associated with any number of entities of B.
3
An entity A can be associated with at-least one entity of B and an entity B can be associated with any number of entities of A.
4
An entity A can be associated with at-least one entity of B and an entity B can be associated with at-least one entity of A.
5
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