Universal Containers wants to use an external large language model (LLM) in Prompt Builder.

Bring Your Own Large Language Model (BYO-LLM) functionality in Einstein Studio allows organizations to integrate and use external large language models (LLMs) within the Salesforce ecosystem. Universal Containers can leverage this feature to connect and ground prompts with external LLMs, allowing for custom AI model use cases and seamless integration with Salesforce data.

Option B is the correct choice as Einstein Studio provides a built-in feature to work with external models.

Option A suggests using Apex, but BYO-LLM functionality offers a more streamlined solution.

Option C focuses on Flow and External Services, which is more about data integration and isn't ideal for working with LLMs.