Which of the following best describes cybersecurity?

Cybersecurity fundamentally revolves around protecting information systems from unauthorized access, damage, or disruption. This includes safeguarding data, networks, and devices through various measures such as firewalls, encryption, antivirus software, and intrusion detection systems. The emphasis on protection highlights the proactive approach taken to ensure that sensitive information remains confidential and secure against various threats.

The other options, while they touch upon certain aspects related to technology, do not encapsulate the full essence of cybersecurity. Financial regulations focus specifically on economic aspects rather than security protocols. Guidelines for employee internet usage address behavior rather than the overarching measures needed to protect systems from cyber threats. Standards for hardware performance optimization deal with the efficiency and functionality of technology rather than its security. Thus, the comprehensive nature of the series of measures to protect information systems aligns perfectly with the definition of cybersecurity.