Option B is the correct approach as it allows you to create a single knowledge base that supports multiple languages. By adding question-and-answer pairs in multiple languages, the system can understand and provide answers in the desired language. Creating separate knowledge bases for each language would be inefficient and difficult to manage. Using a pre-built multilingual model may not provide the customization needed for the company's specific requirements. Integrating a third-party solution may not be feasible due to integration challenges and potential limitations.