Which of the following roles can add an intermediate approver to a case?

The correct choice is that the HR Professional can add an intermediate approver to a case. This role is designed to have the authority and responsibility to facilitate and manage the approval processes within the organization. HR Professionals are typically equipped with the requisite knowledge of policies and procedures, allowing them to determine when an intermediate approver is needed to ensure proper governance and compliance.

In contrast, the remaining roles generally do not possess the same level of authority. A member's involvement is usually limited to participation rather than systems management, while the original case creator may not have the broader responsibilities that an HR Professional entails. Any interested party, lacking the formal role or access to system functionalities, would also not be able to add an intermediate approver as it typically requires specific permissions associated with HR operations. Thus, the HR Professional plays a crucial part in streamlining processes by effectively incorporating additional approvers into cases when necessary.