To answer this question, we need to understand the security risks associated with broadband Internet access for home users. Let's go through each option to understand why it is correct or incorrect:
Option A) Users using peer-to-peer file-sharing networks for breaches of intellectual property - This option is a security risk, but it is not the principal security risk of broadband Internet access proliferation for home users. Peer-to-peer file-sharing networks can expose users to copyright infringement and legal consequences, but it is not the primary concern in this context.
Option B) PCs connected permanently to the Internet are prone to receive more spam mails, thereby increasing the risk for the user to become infected with viruses and Trojans - This option is a security risk, but it is also not the principal security risk in this scenario. While receiving spam emails can increase the risk of virus and Trojan infections, it is not the primary concern in this context.
Option C) PCs will become infected with dialers on DSL lines (run over telephony lines), thereby exposing the user to almost limitless financial risk - This option is a security risk, but it is not the principal security risk of broadband Internet access proliferation for home users. Dialers on DSL lines can potentially lead to financial risks, but it is not the primary concern in this case.
Option D) Home computers that are not securely configured or maintained and are permanently connected to the Internet become easy prey for attackers - This option is the correct answer. The principal security risk of broadband Internet access proliferation for home users is the vulnerability of home computers that are not securely configured or maintained. If home computers are not properly secured, they can become easy targets for attackers, leading to various security breaches and compromises.
The correct answer is Option D. This option is correct because home computers that are not securely configured or maintained and are permanently connected to the Internet pose the most significant security risk for broadband Internet access for home users.