For the Following Entity-Relationship Diagram, What Could the Primary Key

question 54

Multiple Choice

For the following entity-relationship diagram, what could the primary key be in the Grade entity?

• A) Primary key in Student entity
• B) Primary key in Course entity
• C) Its own primary key.
• D) Primary key made up of the primary keys in Student entity and Course entity
• E) It doesn't need a primary key.

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Definitions:

Food and Drug Administration

A federal agency of the United States responsible for protecting and promoting public health through the control and supervision of food safety, tobacco products, dietary supplements, prescription and over-the-counter pharmaceutical drugs, vaccines, biopharmaceuticals, blood transfusions, medical devices, electromagnetic radiation emitting devices, cosmetics, and veterinary products.

Public Interest Theory

A theory suggesting that regulation is supplied in response to the demand of the public for the correction of inefficient or inequitable market practices.

Industrial Regulation

Government policies and rules aimed at regulating and controlling industry practices to promote fair competition, protect consumer interests, and prevent market abuses.

Natural Monopolies

A market structure where a single firm can produce the entire market output at a lower cost than could multiple firms, often due to high fixed costs.