In legal research, the principle of 'TRIANGULATION' refers to:

1. TRIANGULATION is a strategy in research methodology to ENHANCE VALIDITY and reduce bias by using multiple methods, sources, or perspectives. 2. TYPES (Denzin): 3. (i) DATA TRIANGULATION — using different sources; 4. (ii) INVESTIGATOR TRIANGULATION — multiple researchers; 5. (iii) METHODOLOGICAL TRIANGULATION — using different methods (e.g. surveys + interviews + observation); 6. (iv) THEORY TRIANGULATION — multiple theoretical frameworks. 7. EXAMPLE in legal research: studying judicial decision-making could involve (i) DOCTRINAL ANALYSIS of judgments; (ii) STATISTICAL ANALYSIS of decision patterns; (iii) INTERVIEWS with judges and lawyers; (iv) ARCHIVAL research on judge backgrounds. 8. Hence option B is correct. _Source: Legal Research Methodology + Jurisprudence — Triangulation in social science research_