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

Which of the following definitions best describes 'Base Characteristic Qualifier'?

A. A composite qualifier combines multiple qualifiers. Each composite qualifier has a base qualifier and a reference to another qualifier. Composite qualifiers are ordered (through hasNextQualifier) to distinguish between the scope of qualifiers, e.g., AverageMinimum versus MinimumAverage.
B. A the concept is the product of at least two base or derived units. For example, 'meter per second square' denotes a the concept defined over 'meter' (a base unit) and 'per second square' (a derived unit).
C. the concept, radiant emittance, and radiant exitance are radiometry terms for the power per unit area of electromagnetic radiation at a surface. "the concept" is used when the electromagnetic radiation is incident on the surface. "Radiant exitance" or "radiant emittance" is used when the radiation is emerging from the surface. The SI units for all of these quantities are watts per square meter (W/m2) (wikipedia). All of these quantities characterize the total amount of radiation present, at all frequencies. It is also common to consider each frequency in the spectrum separately. When this is done for radiation incident on a surface, it is called spectral the concept, and has SI units W/m3, or commonly W·m−2·nm−1.
D. A base qualifier denotes a simple, atomic qualifier such as average, minimum, and maximum.

Answer: A base qualifier denotes a simple, atomic qualifier such as average, minimum, and maximum.