The correct answer is Failure modes . Condition-based monitoring must be selected according to the way the asset can fail. Vibration analysis is useful for many rotating mechanical defects; oil analysis is useful for lubricant degradation, contamination, and wear debris; thermography is useful for heat-related electrical and mechanical abnormalities; ultrasound is useful for leaks, arcing, corona, and certain bearing conditions. The correct technology depends on the failure mode being detected. Option B is wrong because technical capability should support the strategy, not drive it. Buying a technology because it is available, fashionable, or technically impressive creates poor reliability decisions if it does not detect the relevant defect. Option C is also wrong because certification proves technician competence, but it does not determine which condition monitoring method is technically appropriate. In CRL Asset Condition Management, the discipline is matching condition indicators to credible failure modes so maintenance can intervene before functional failure. Condition-based maintenance guidance specifically states that the CBM program should be based on asset and component failure modes and use monitoring equipment appropriate to those modes.