A technology company plans to deploy a single, large, pre-trained language model to serve three distinct functions: a customer support chatbot, a document summarizer, and a code generator. To optimize for efficiency, they want to avoid storing and maintaining multiple, separate copies of the large model. Which approach best achieves this goal by keeping the original model's architecture intact?

Efficiency of Parameter-Efficient Tuning

Match each description of a model adaptation method with its corresponding impact on the model's architecture and deployment efficiency.