The COBIT® 2019 Design Guide explicitly defines its primary target audience as professionals responsible for designing, tailoring, and sustaining enterprise governance systems for information and technology. This includes governance professionals, enterprise architects, senior IT leaders, and consultants involved in governance system design decisions.

While assurance professionals, internal auditors, and other stakeholders may benefit from understanding the Design Guide, they are not the primary audience. Their roles are more directly supported by the Governance and Management Objectives guide and assurance-related materials.

The Design Guide focuses on design factors, governance system components, and structured workflows to tailor governance solutions based on enterprise context. This requires decision-making authority and design accountability, which typically reside with governance professionals rather than operational IT staff or assurance teams.

Although a broad group of stakeholders may use the guide indirectly, COBIT makes a clear distinction between primary and secondary audiences. Therefore, the correct answer is that the Design Guide is primarily intended for governance professionals involved in designing governance solutions.