Using the Database Depicted Below,how Many Foreign Keys Are in the Database

question 32

Multiple Choice

Using the database depicted below,how many foreign keys are in the database?

• A) 0
• B) 3
• C) 4
• D) 5

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Definitions:

Existential Generalization

A logical inference rule stating that if an assertion is true for some member of a domain, then there exists an element in that domain for which the assertion holds.

Universal Generalization

A logical principle stating that what is true of all instances of a certain class can be said to be generally true of that class.

Existential Instantiation

A logical principle allowing for the inference of the existence of an instance of a predicate from a statement asserting the existence of some (possibly unspecified) instance.

Universal Instantiation

A logical rule stating that if something is true for everything in a certain category, it is true for each specific member of that category.