A wiki
a. is a brief message exchanged in real time using a short message service supplied by a cell phone provider or a voice over Internet protocol service.
b. is a website with journal entries on a variety of topics.
c. consists of short audio and video files that deliver repetitive information and that can be downloaded and played on numerous devices.
d. is a Web-based tool that uses collaborative software to allow multiple users to create, access, and modify documents.