Which option is NOT a protocol for general system security?

Choosing system software as the option that is not a protocol for general system security is accurate because system software itself does not constitute a security measure or protocol. Rather, it serves as the underlying interface between hardware and application software, facilitating operational tasks. While system software can include security components, it is not a security protocol in and of itself.

On the other hand, access control measures are integral to ensuring that only authorized users can access sensitive data and resources. Regular security audits help identify vulnerabilities and weaknesses within a system, enabling proactive measures to reinforce security. Data encryption methods protect sensitive information by converting it into a secure format that can only be read by authorized parties, thus serving as a cornerstone of data protection strategies. Each of these elements plays a critical role in establishing a secure environment for data and systems, whereas system software is mainly a foundational component rather than a dedicated security measure.