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

Which of the following definitions best describes 'anchor date'?

A. fixed reference point within a series or timeline
B. explicit number of days from the adjusted effective or start date to the adjusted termination or end date calculated in accordance with the applicable day count fraction
C. length of time that something or someone has been alive or existed
D. recurrence interval that is defined as the nth day of some calendar period (such as a calendar month), and a time direction (forward from the beginning of the month, or backwards from the end)

Answer: fixed reference point within a series or timeline