For a Unary One-To-One Relationship Between Two Entities a and B

question 9

Multiple Choice

For a unary one-to-one relationship between two entities A and B, the relationship is represented by:

• A) adding the primary key of A as a foreign key of B.
• B) adding the primary key of B as a foreign key of A.
• C) combining the two entities into one relation.
• D) creating a third relation to represent the relationship between the two entities.
• E) either A or B.

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Definitions:

Halogens

A group of elements found in Group 17 of the periodic table, characterized by their high reactivities and tendencies to form salts with metals.

Main Group Non-metal

Elements located in the s and p blocks of the periodic table, excluding metalloids and metals, essential for various biological and industrial processes.

Transition Metal Elements

Elements found in groups 3 through 12 of the periodic table, characterized by their ability to form stable compounds with variable oxidation states.

Ionic

Relating to or involving ions, typically describing chemical bonds formed through the electrostatic attraction between oppositely charged ions.