Which of the following strategies might be employed to enhance online security against spoofing?

Regularly changing passwords is a fundamental strategy to enhance online security against spoofing. Spoofing often involves an attacker gaining access to a user’s account by exploiting weak or compromised passwords. By frequently updating passwords, users reduce the risk of unauthorized access, as even if a password is obtained by an attacker, it becomes quickly outdated and ineffective. This practice helps ensure that any potential breach is minimized over time.

Other strategies, while they may provide some level of security, do not directly address the vulnerabilities that come with spoofing attacks. Static IP addresses can help to control network access but can also make the network a target if the IP address becomes known to attackers. Minimizing internet usage may reduce exposure but isn't a practical solution for most users in today's connected world. Adopting a single security protocol can lead to a lack of flexibility and could expose a system to vulnerabilities if that protocol is compromised. Therefore, regularly changing passwords is a proactive measure that specifically counters the likelihood of successful spoofing attempts.