Which of the Following Is a Specialization Hierarchy Disjoint Constraint

question 18

Multiple Choice

Which of the following is a specialization hierarchy disjoint constraint scenario in case of partial completeness?

• A) Subtype discriminator can be null.
• B) Subtype discriminator cannot be null.
• C) Each supertype occurrence is a member of only one subtype.
• D) Each supertype occurrence is a member of at least one subtype.

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Definitions:

Oculus

A circular opening at the top of a dome or in a wall, allowing light and air into the space below; notably used in Roman and Renaissance architecture.

Emperor of the West

Historically refers to the ruler of the Western Roman Empire, specifically after its division from the Eastern Empire.

Honorius

A Roman Emperor of the West (395-423 AD) known for his reign during the period of the empire's decline in the face of Visigothic invasions and internal strife.

Constantinople

The historical name for the modern city of Istanbul from its founding in 330 AD until the Ottoman conquest in 1453, serving as the capital of the Byzantine Empire.