Task: Class Definition Understanding (ontology: Legal/LKIF_Core_Ontology)

Which of the following definitions best describes 'Pair'?

A. A the concept is an atomic period of time, i.e. it cannot be divided into other parts
B. An the concept is a composition of multiple periods of time.
C. A composition of exactly two parts
D. A pair of two time periods

Answer: A composition of exactly two parts