In a relational database design,all relationships are expressed by ________.
A)creating a primary key
B)creating a foreign key
C)creating a supertype
D)creating a subtype
E)creating a line between entities

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Relationships in a relational database design are expressed by creating foreign keys that create a link between two tables based on a common field. This establishes a relationship between the two tables, allowing for data to be retrieved from both tables when necessary. A primary key is used to uniquely identify each record in a table, but it does not necessarily establish a relationship between tables. Supertypes and subtypes are concepts used in entity relationship modeling, but not directly related to expressing relationships in a relational database design. A line between entities may indicate a relationship, but it does not establish a connection between tables in a database.

In a Relational Database Design,all Relationships Are Expressed by ________