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:

Hydrogenating

The process of adding hydrogen to a molecule, usually in the presence of a catalyst, to reduce double or triple bonds to single bonds.

Monocyclic Saturated Compound

An organic chemical compound featuring a single cyclic structure without double or triple bonds, indicating all carbons are saturated with hydrogen.

Molecular Formulas

A notation that shows the type and number of atoms in a molecule but not the bonds or arrangement, such as C2H5OH for ethanol.

Elements of Unsaturation

Refers to the presence of double or triple bonds and/or rings in a compound, which reduce the total number of hydrogen atoms the compound can contain.