Key components of an Entity-Relationship Model (ERM) include:
B . an attribute: Attributes are properties or characteristics of an entity, such as a person's name, date of birth, etc., and are essential in describing the data aspects of an entity in an ER model.
E . a relationship: Relationships describe how entities interact with each other within the database structure, such as a customer placing an order.
F . an entity: Entities are the key components of an ER model, representing objects or things within the domain that have a distinct existence, like 'Customer' or 'Order'.
Incorrect options:
A: A table is a database structure used to implement an entity in relational databases, not a component of the ER model itself.
C: While unique identifiers are crucial in database implementation (typically as primary keys), they are a specific attribute type, not a general component of ER models.
D: An activity is not a component of an ER model; activities relate more to process models or behavioral models in systems design.