Which of the following ensures the protection of data on a computer system?

The protection of data on a computer system is a multifaceted approach that involves multiple strategies working together. Each of the listed options contributes significantly to enhancing data security.

Using strong passwords is fundamental as it restricts unauthorized access to accounts and files, making it considerably harder for malicious actors to gain entry into the system. A strong password typically combines upper and lower case letters, numbers, and special characters, thus increasing its effectiveness.

Running antivirus software plays a crucial role in identifying and eliminating malware before it can cause damage or steal sensitive information. It actively scans for known threats and can also detect suspicious behavior, which helps maintain the integrity of the data.

Regularly updating software is essential for safeguarding against vulnerabilities. Software updates often include security patches that fix known weaknesses, ensuring that the system is equipped to defend against new threats that may emerge.

Together, these strategies form a comprehensive security protocol that collectively ensures the protection of data on a computer system. By integrating strong passwords, antivirus protection, and regular updates, users can significantly reduce the risk of data breaches and enhance overall security. Therefore, acknowledging all these measures as critical components of data protection supports the correctness of the selected answer.