Which notation is specifically used for data flow diagrams?

Yourdon Notation is specifically used for data flow diagrams (DFDs), making it the correct choice. This notation emphasizes the flow of data within a system, detailing how data is processed by different entities and data stores. Yourdon Notation helps illustrate the relationships between these entities, depicting how information enters and leaves processes, which is essential for understanding system requirements and functionality.

In contrast, the other notations serve different purposes. UML (Unified Modeling Language) is a comprehensive modeling language used for software engineering that encompasses multiple types of diagrams for different aspects of development, not just focusing on data flow. ERD (Entity-Relationship Diagram) Notation is utilized to model the data structures and relationships in databases, rather than the flow of data. Flowchart Notation provides a graphical representation of a process or algorithm, showing steps in a sequence, but it does not specialize in depicting data flow and processing within a system like Yourdon does.