Question

what type of cardinality is demonstrated by the following erd? a.) a student can belong to multiple classes. a class can have multiple students. b.) a student can belong to a class. a class can have multiple students. c.) a student can belong to multiple classes. a class can have a student. d.) a student can belong to a class. a class can have a student.

Answer 1

The ERD in question demonstrates different types of cardinalities: Many-to-Many, One-to-Many, Many-to-One, and One-to-One, which describe the different numbers of entities related to one another.

Step-by-step explanation:

Cardinality in Entity-Relationship Diagrams (ERDs)

The cardinality in an ERD specifies the number of relationships between entities. There are four types of cardinalities represented in the question:

• Many-to-Many (a student can belong to multiple classes, a class can have multiple students) - Option a.
• One-to-Many (a student can belong to a class, a class can have multiple students) - Option b.
• Many-to-One (a student can belong to multiple classes, a class can have a student) - Option c.
• One-to-One (a student can belong to a class, a class can have a student) - Option d.

Each of these cardinalities show different possible associations between students and classes.