Which U.S. government's published guidelines should Hattie become familiar with in her cybersecurity role?

The National Institute of Standards and Technology (NIST) provides a comprehensive framework and guidelines that are essential for cybersecurity professionals in the United States. NIST's publications, particularly the NIST Cybersecurity Framework, establish best practices and standards for managing and reducing cybersecurity risks. Understanding these guidelines enables individuals and organizations to better protect their information systems and respond to cyber threats effectively.

NIST's guidelines are widely recognized and regularly updated, reflecting the constantly evolving nature of cybersecurity threats. By familiarizing herself with NIST standards, Hattie will gain access to relevant resources that cover risk management, incident response, security controls, and compliance considerations, which are critical in today’s cybersecurity landscape.

The other options, while relevant in certain contexts, do not solely focus on U.S. government guidelines or are more specialized in nature. For instance, ISO offers international standards applicable globally, PCI-DSS is specific to payment card security, and COBIT focuses on enterprise IT governance, making NIST the most suitable choice for a foundational understanding of cybersecurity within the framework of U.S. government guidance.