When a 1:1 binary relationship is represented by using the relational model: C) the key of either entity is placed in the other as a foreign key.
<h3>What is an entity relationship?</h3>
An entity relationship refers to a data model with the highest level of abstraction and it's designed to avail designers an ability to use a graphical tool to examine structures rather than describe them by using text.
In Computer technology, when a 1:1 binary relationship is represented by using the relational model, the true statement is that the key of either entity is usually placed in the other entity as a foreign key.
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Complete Question:
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.
