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

Which of the following classes does 'tar' belong to as one valid explicit type? Context: tar is a format standard of a digital entity that is conformant with the tape archive file format as standardized by POSIX.1-1998, POSIX.1-2001, or any other tar format compliant with the GNU tar specification. (http://www.gnu.org/software/tar/manual/)

A. action specification
B. data format specification
C. categorical value specification
D. programming language

Answer: data format specification