Task: Instance Class Understanding (ontology: Sciences/Computer_Science)

Which of the following classes does 'ACS' belong to as one valid explicit type? Context: ACS is a format standard of a digital entity that is conformant with the Analytical Cytometry Standard. (http://www.isac-net.org/content/view/607/150/)

A. GNU AGPL
B. data format specification
C. licence
D. datum label

Answer: data format specification