Which description best fits a data mart?

• A. Large enterprise-wide repository
• B. A subset of a data warehouse focusing on a specific business line
• C. Real-time streaming store
• D. Data lake for unstructured data

Answer: (B)

A data mart is a focused, subject-specific slice of a data warehouse designed for fast, targeted analytics by a particular business line or user group. This description fits because it highlights a subset of the enterprise data warehouse that is curated for a specific domain, making it easier for analysts in that area to access and analyze relevant data quickly. In contrast, an enterprise-wide repository refers to a full data warehouse, not a subset for one line of business; a real-time streaming store emphasizes continuous data ingestion and processing rather than a curated, historical analytics subset; and a data lake for unstructured data stores raw, often heterogeneous data without the same level of integrated, pre-processed analytics-ready structure. Therefore, the best fit is a subset of a data warehouse focusing on a specific business line.