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Your organization's marketing team is building a customer recommendation chatbot that uses a generative AI large language model (LLM) to provide personalized product suggestions in real time. The chatbot needs to access data from millions of customers, including purchase history, browsing behavior, and preferences. The data is stored in a Cloud SQL for PostgreSQL database. You need the chatbot response time to be less than 100ms. How should you design the system?
Correct Answer: D
A caching layer is essential to reduce database access time, meeting the <100ms requirement. Caches store high-frequency, low-latency queries in memory, minimizing access delays caused by database lookups. While AlloyDB (Option B) provides performance benefits, a caching layer is more efficient and cost-effective for this purpose. BigQuery ML (Option A) is less ideal for real-time personalized responses due to access speed, and vector embeddings (Option C) are not needed unless semantic search is a requirement.