Which of the following communication systems allows a group of people to enter, modify and contribute one or more pages of related text?

A wiki lets a group of people enter, edit and contribute to one or more linked pages of text.

Email sends messages between individuals and does not offer shared page editing.

A podcast is a published audio or video file that listeners consume, not edit.

An RSS feed delivers updates from a site to subscribers, a one-way channel.

Wikipedia is the best-known example of a collaboratively edited wiki.

Wikis keep a revision history so changes can be tracked and reverted.