Which of the Following Is True of Packaged Data Models

question 57

Multiple Choice

Which of the following is true of packaged data models?

• A) Relationships are connected to the highest-level entity type in an order that makes sense.
• B) All subtype/supertype relationships follow the total specialization and disjoint rules.
• C) No entities on the many sides of a relationship can be weak.
• D) All weak entities are considered strong.

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Definitions:

Quartz

A hard, crystalline mineral composed of silicon and oxygen atoms, widely used in jewelry and electronics.

Halite

Also known as rock salt, a mineral form of sodium chloride (NaCl) that often occurs in evaporite deposits.

Crystal

A solid material whose atoms are arranged in highly ordered, repeating patterns extending in all three spatial dimensions.

Cleavage

The tendency of a mineral to break along flat planar surfaces as determined by the mineral’s crystal structure, often enhancing its gem quality.