Which of the following describes tactics used in hacking?

The correct choice describes a core aspect of hacking activities. Hacking often involves gaining unauthorized access to systems or networks to retrieve confidential information. This could include sensitive data such as personal identification details, financial information, or corporate secrets. Accessing such information is typically the goal of malicious actors who exploit vulnerabilities in systems to enhance their own advantage or disrupt operations.

On the other hand, while creating software applications, building firewalls, and conducting user training are related to technology and cybersecurity, they do not directly represent hacking tactics. Creating software applications can be part of development processes that aim at legitimate use or enhancing security. Building firewalls is a defensive measure that protects systems from unauthorized access, and conducting user training is focused on educating individuals about safe practices to prevent hacking. These activities contribute to the security landscape but do not embody the offensive tactics employed by hackers targeting confidential information.