Natural Language Processing (NLP) is the specific branch of AI focused on the interaction between computers and human language. For tasks involving the review, summarization, and extraction of insights from unstructured text documents like legal contracts, NLP is the most suitable technology. It allows the system to understand semantic meaning, identify clauses, and detect inconsistencies within a legal context. While NLP often utilizes Deep Learning (Option A) and Neural Networks (Option B), those are the underlying " architectures, " whereas NLP is the specialized " application " required for document analysis. ML (Option D) is a broad category that includes NLP but lacks the specificity required for linguistic processing.