Task: Class Definition Understanding (ontology: Earth_Environment/OBOE)

Which of the following definitions best describes 'Measured Characteristic'?

A. A the concept of an entity is one that is measurable within the physical world. A the concept includes primary and derived physical dimensions (e.g., length, mass, area, density). The measured value assigned to a the concept may be a quantity (a numerical value) or a quality (a category), including both nominal and ordinal categories.
B. the concept is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The SI unit for the concept is candela per square metre (cd/m2).
C. the concept amount of substance of solute B in a solution divided by the mass of the solvent: Often favored because measurements of mass are more precise than measurements of volume.
D. The number of photons striking an area per unit time. This could be probably also be called a PhotonArealDensityRate.

Answer: A the concept of an entity is one that is measurable within the physical world. A the concept includes primary and derived physical dimensions (e.g., length, mass, area, density). The measured value assigned to a the concept may be a quantity (a numerical value) or a quality (a category), including both nominal and ordinal categories.