Which of the Following Statements About XBRL Is Most True

Which of the following statements about XBRL is most true?

A) Because it is extensible, companies can create new specifications that reside in an Internet namespace.
B) Because it is organized in taxonomies, it is extensible.
C) Because it is extensible, companies can create tags that are used in instance documents, as long as they are defined in a namespace.
D) All of these statements are true.