David, a cybercriminal, targeted a community and initiated anti-social campaigns online. In this process, he used a layer of the web that allowed him to maintain anonymity during the campaign. Which of the following layers of the web allowed David to hide his presence during the anti-social campaign?

The Dark Web is a segment of the Deep Web that is intentionally hidden and requires specific software, such as the Tor (The Onion Router) browser, for access. Its infrastructure is designed to provide a high degree of anonymity by encrypting and routing user traffic through a volunteer-run, layered network of servers, making it extremely difficult to trace the user's identity and location. This feature of anonymity is precisely why cybercriminals and other actors use it to conduct illicit or anti-social activities, such as the campaign initiated by David, while concealing their presence.

A. Surface Web: This is the publicly indexed and easily accessible part of the internet. Activities on the Surface Web are generally traceable and do not offer the anonymity required for such a campaign.
B. World Wide Web: This is a broad term for the entire information system on the internet, which includes the Surface, Deep, and Dark Webs. It is not a specific layer that provides anonymity.
D. Deep Web: This refers to all parts of the web not indexed by search engines, such as online banking portals or private databases. Access is often restricted, but it is not inherently designed for anonymity.

1. Finklea, K. (2017). Dark Web. Congressional Research Service. On page 1, the report defines the layers: "The Internet can be conceptually divided into three different regions: the Surface Web, the Deep Web, and the Dark Web... The Dark Web is a portion of the Internet that is intentionally hidden from search engines, uses masked IP addresses, and is accessible only with a special web browser." This highlights its intentional concealment and anonymity features.

2. Moore, D., & Rid, T. (2016). Cryptopolitik and the Darknet. Survival, 58(1), 7-38. https://doi.org/10.1080/00396338.2016.1142085. The article discusses (p. 8) how the Dark Web, primarily accessed via Tor, uses "onion routing" to "provide users with anonymity online," which is its core technical feature exploited for covert activities.

3. Owen, G., & Savage, N. (2015). The Tor Dark Net. Global Commission on Internet Governance, Paper Series: No. 20. This paper explains (p. 3) that "Tor is designed to allow its users to browse the Internet anonymously... This anonymity is attractive to many groups of people... including criminals." This directly supports the use of the Dark Web for criminal anonymity.