In an EER diagram, an "O" on the relationship line next to an entity is used to indicate that

In an EER diagram, an "O" on the relationship line next to an entity is used to indicate that

In an EER diagram, an "O" on the relationship line next to an entity is used to indicate that




a. The entity's participation in the relationship is optional
b. The entity's participation in the relationship is mandatory
c. There are no instances of that entity (empty set)
d. There are no primary keys defined for the entity
e. There are no secondary keys in the entity (all key relation)





Answer: A