* To evaluate a Conversational Language Understanding (CLU) model, you can: * Use the REST authoring API to retrieve the model's evaluation summary (precision, recall, F1 score). * In Language Studio, use the Model performance section to view evaluation metrics and confusion matrix. * Active Learning (option B) is for improving the model post-deployment by validating unclear utterances, not pre-deployment evaluation. * Log collection in Log Analytics (option D) is for monitoring, not formal evaluation. The answer: A and C Reference: Evaluate a Conversational Language Understanding model