Traditionally, LangChain chains (e.g., LLMChain) are created using Python classes that define sequences of operations, such as calling an LLM or processing data. This programmatic approach predates LCEL’s declarative style, making Option C correct. Option A is vague and incorrect, as chains aren’t ML algorithms themselves. Option B describes LCEL, not traditional methods. Option D is false, as third-party integrations aren’t required. Python classes provide structured chain building.
OCI 2025 Generative AI documentation likely contrasts traditional chains with LCEL under LangChain sections.
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