Which of the following is true when representing a 1:1 binary relationship using the relational model?
A) The key of the entity with the highest minimum cardinality must be placed in the other entity as a foreign key.
B) The key of each entity must be placed in the other as a foreign key.
C) The key of either entity is placed in the other as a foreign key.
D) The key of the entity with the most attributes must be placed in the other entity as a foreign key.
E) Both entities must have the same primary key.

Question

Quizplus · Accepted Answer

In a 1:1 binary relationship, each instance of one entity is associated with one and only one instance of the other entity, and vice versa. Therefore, the key of either entity can be placed in the other entity as a foreign key to establish the relationship. This choice allows for flexibility in the design and does not favor one entity over the other.

Which of the Following Is True When Representing a 1:1