Which of the Following Is True of Corporate Wikis

Which of the following is true of corporate wikis?

A) They are a form of Web conferencing that uses streaming media to broadcast video over the Internet.
B) They are easy to link to useful corporate information systems such as phone books.
C) They provide corporate users with the ability to see a colleague's availability status.
D) They are a set of cloud-based software and services that provides office applications and collaboration capabilities to subscribers.