What types of interviews can the PRB carry out during investigations?

The correct answer highlights the broad scope of interviews that the Professional Regulation Board (PRB) can conduct during investigations. This includes interviews with the regulated member, clients, and employers, which is crucial for gathering comprehensive evidence and understanding various perspectives surrounding a particular issue or complaint.

Interviewing the regulated member allows the PRB to hear firsthand about the situation in question and gather an account that may clarify or contradict allegations. Engaging with clients is essential as they can provide insights on their experiences and how they were affected by the member's actions. Additionally, interviewing employers can shed light on the professional's conduct within the organizational context and any relevant workplace policies or practices that may influence the situation at hand. This multi-faceted approach to interviewing ensures that the PRB collects diverse viewpoints, ensuring a thorough and fair investigation.

The other choices are too limited in scope. Focusing solely on interviews with coworkers, the public, or external agencies would restrict the investigation's effectiveness and could lead to incomplete conclusions. A well-rounded understanding of the situation necessitates engaging with all relevant parties.