To answer the following questions, refer to the database below. 
-Which database integrity rule ensures each record may be retrieved from the database using a unique identifier?
Definitions:
Marketing Concept
The business ideology that focuses on identifying and meeting the needs and wants of customers through the product or service being sold.
Satisfying Needs
The fulfillment of a requirement, necessity, or desire through the use or consumption of products or services.
Social Media Sites
Online platforms where users can create, share, or exchange information, ideas, and pictures/videos in virtual communities.
Business World
Refers to the global environment comprising all individuals, companies, organizations, and activities involved in the production, distribution, and consumption of goods and services.
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