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

question 15

Multiple Choice

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.

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