A business plans to expand an AI assistant that handles customer requests. It needs trustworthy inputs and responsible outcomes. Which two activities most directly support these goals? Select 2 answers.

1. Evaluate representative cases and relevant user groups, with suitable human oversight.
2. Remove all review because generated text is fluent.
3. Choose the largest model and assume it eliminates bias and factual errors.
4. Review source data quality, freshness, and permitted use.
5. Measure success only by the number of generated responses.