Task: Instance Class Understanding (ontology: Business_Finance/Financial_Industry_Business_Ontology)

Which of the following classes does 'calendar year' belong to as one valid explicit type? Context: cyclic time interval in a calendar which is required for one revolution of the Earth around the Sun and approximated to an integral number of calendar days; a year in the Gregorian calendar

A. explicit duration
B. date period
C. date time
D. calendar period

Answer: calendar period