1. A startup is building a conversational AI assistant using Azure AI Foundry. The team wants to quickly prototype using a pre-trained large language model without any custom training data. The assistant must answer general business questions and summarize documents. Which approach best fits this scenario?
- A. Fine-tune an Azure OpenAI GPT model on a proprietary dataset to improve domain specificity.
- B. Use prompt engineering with a pre-trained Azure OpenAI model, crafting system prompts to guide behavior.✓ Correct
- C. Train a custom neural network from scratch using Azure Machine Learning to avoid licensing costs.
- D. Use Retrieval-Augmented Generation (RAG) with a vector index before any other approach to ensure accuracy.
Explanation
Prompt engineering with a pre-trained model is the fastest, lowest-cost starting point when no custom training data exists and the task is general-purpose. It requires no training pipeline or labeled data. Fine-tuning (A) requires labeled examples and additional cost, which is unnecessary here. Training from scratch (C) is impractical for a startup with no training infrastructure or data. RAG (D) adds architectural complexity and requires a document index; it is valuable but not the simplest first choice when the task is already general and no specific knowledge base is mandated.