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

Which of the following classes does 'zip' belong to as one valid explicit type? Context: zip is a format standard of a digital entity that is conformant with the PKWARE .ZIP file format specification (http://www.pkware.com/index.php?option=com content&task=view&id=59&Itemid=103/)

A. datum label
B. source code module
C. data format specification
D. occurrent

Answer: data format specification