What Is a Primary Key

question 53

Multiple Choice

What is a primary key?

• A) A field (or group of fields) that uniquely identifies a given entity in a table
• B) A primary key of one table that appears as an attribute in another table and acts to provide a logical relationship among the two tables
• C) Characteristics or properties of an entity class
• D) A field (or group of fields) that uniquely identifies a given attribute in a table

---

Definitions:

Classical Conditioning

A learning strategy in which two stimuli are continually paired; the response that is initially attracted by the second stimulus is in time attracted by the first stimulus alone.

Observational Learning

The act of acquiring behaviors through observation and replication of others.

Classical Conditioning

A method of instruction that occurs by forming associations between a stimulus present in the surroundings and a spontaneously occurring stimulus, culminating in an acquired response.

Operant Conditioning

A strategy of learning wherein the impact of a response is adjusted through the provision of incentives or the application of penalties.