(c) The requirement is to distinguish between the Web
2.0 applications. Answer (c) is correct because RSS feeds (and
Atom feeds) are XML applications that are designed specifically
for sharing and syndication of web content. The acronym RSS
refers to Really Simple Syndication. (Atom feeds are similar to
RSS feeds). Answer (a) is incorrect because a wiki is a collaboratively-
developed information sharing website. Answer (b) is
incorrect because a blog is a moderator-led electronic discussion.
Answer (d) is incorrect because Twitter is similar to a blog but
restricts input to 140 characters per entry.