What can help reduce risks to computer systems?

Avoiding public networks is a significant measure for reducing risks to computer systems because public networks, such as those found in coffee shops or airports, are often less secure and can be targeted by cybercriminals. These networks can expose users to various threats, including data interception, malware distribution, and unauthorized access to sensitive information. By avoiding these public connections, users can significantly lower their exposure to potential attacks and maintain better control over their data security.

The other options typically involve higher risk. For instance, using secured sites does contribute to security but depends on the secure nature of those sites and still does not offset the dangers of using an unsecured public network. Staying connected to random Wi-Fi can lead to severe vulnerabilities, as these connections can easily be compromised. Likewise, using all types of networks encompasses a range of vulnerabilities, particularly with insecure public options. Hence, steering clear of public networks stands out as the most effective precautionary measure.