Which of the following investigation techniques allows the analyst to build rapport, discuss confidential issues...

The investigation technique best suited to achieve these outcomes is the Interview. A one-on-one interview provides a private and focused setting, which is essential for discussing confidential or politically sensitive issues that a stakeholder would not be comfortable raising in a group or on a written questionnaire. The personal interaction during an interview is the most effective way to build rapport with the stakeholder, leading to more open and honest communication. This deeper level of trust and detailed conversation is what allows the analyst to gain a richer appreciation of the political and cultural landscape of the business. Special purpose records, document analysis, and questionnaires are more impersonal and cannot provide the same level of qualitative insight or trust.

(Reference: BCS Foundation Certificate in Business Analysis / BCS Business Analysis Practice – Investigative Techniques, Interviews)