What security method involves multiple layers to protect data?

The correct answer is grounded in the principle of defense in depth, which is integral to ensuring robust protection of data. Layered security protocols utilize multiple security measures to protect information, thereby creating several hurdles that an attacker must overcome to breach security. This methodology involves a combination of various tools and practices, such as firewalls, intrusion detection systems, encryption, and access controls. Each layer offers its own defenses and mitigates the risk of a single point of failure.

For instance, if one layer is compromised, others still provide protection, thus significantly enhancing overall security. This strategy is effective in addressing different types of threats, as it does not rely solely on one single method for protection.

In contrast, basic password protection and a single firewall represent singular, isolated security measures. They do not provide the comprehensive coverage that layered protocols do, making them less effective in face of sophisticated attacks. Data elimination methods focus on disposing of data to prevent unauthorized access but do not serve as a protective measure during the data's lifecycle. Therefore, layered security protocols stand out as the most effective approach to maintaining data integrity and confidentiality.