Which of the following can be best used to discover a company's publicly available breach information?

Security Information and Event Management (SIEM) systems are primarily used for real-time analysis of security alerts generated by applications and network hardware. While SIEM can help identify breaches within an organization's infrastructure, it does not focus on publicly available breach information outside the organization, making it less effective for this purpose.

Common Vulnerabilities and Exposures (CVE) is a list of publicly disclosed cybersecurity vulnerabilities and exposures. While it provides valuable information about known vulnerabilities, it does not serve as a tool for discovering breach information specific to any one company, but rather catalogs vulnerabilities across various systems.

The Common Vulnerability Scoring System (CVSS) is a standard for assessing the severity of vulnerabilities. Like CVE, it focuses on the evaluation of vulnerabilities rather than the discovery of breaches. CVSS scores do not provide insights into whether a company has experienced a data breach, thus making it unsuitable for identifying publicly available breach information.