What action should be taken regularly to protect against vulnerabilities?

Changing passwords regularly is a crucial action to protect against vulnerabilities because it helps mitigate the risk of unauthorized access to sensitive information. Regular password updates reduce the window of opportunity for attackers who may have acquired passwords through various means, such as phishing, keylogging, or breaches of other services. This practice not only ensures that an account remains secure over time but also encourages the use of unique, complex passwords that further enhance security.

In addition, regularly changing passwords can help individuals or organizations identify any potentially compromised accounts sooner rather than later. It is generally recommended to follow best practices, such as creating strong passwords that combine letters, numbers, and special characters and utilizing password managers to maintain unique passwords for different accounts.

The other options do not contribute to effective security practices. Ignoring security warnings can lead to exposure to threats; expanding network access may increase the risk of attacks; and disabling antivirus software leaves systems vulnerable to malicious software. Each of these actions counteracts the goal of maintaining a secure computing environment.