Which of the following are examples of different cybersecurity breaches?

Cybersecurity breaches involve unauthorized access to data, systems, or networks, usually resulting in some form of compromise. Among the choices, viruses are a prime example of a cybersecurity breach because they are malicious software designed to infiltrate computers and networks, often leading to data loss, disruption of services, or unauthorized access. Viruses can replicate themselves and spread to other machines, which can compromise entire networks.

While spam emails and phishing attacks are related to cybersecurity risks, spam emails themselves are often just unsolicited messages that may not necessarily involve a security breach. Phishing, on the other hand, is a method used to deceive individuals into divulging sensitive information and could lead to a security breach; however, it doesn't inherently describe a breach itself.

Network configuration errors represent a type of vulnerability or misconfiguration that may lead to potential breaches but are not breaches in themselves. They can expose systems to exploitation if an attacker takes advantage of these errors, but the errors themselves do not constitute a breach without exploitation occurring.

Thus, focusing on the nature of viruses as active threats that exploit vulnerabilities to cause harm clarifies why this choice is an example of a cybersecurity breach.