What elements can be contained within a Package Diagram?

A Package Diagram is a structural diagram in UML (Unified Modeling Language) that illustrates how a system is divided into packages, and how these packages are related to one another. The correct choice indicates that a Package Diagram can contain packages, blocks, actors, and value types, which are all significant components in UML modeling.

Packages serve as containers that group related elements, while blocks can represent components or significant parts of the system, providing a way to encapsulate data and behavior. Actors typically denote the roles that users or other systems play in relation to the system being modeled, representing external entities that interact with the system. Value types are used to define data types that represent a set of values in the model.

Incorporating these elements allows for a comprehensive representation of the system architecture and helps clarify the relationships and dependencies between different parts of the system. This contributes to better organization and understanding of the model, particularly when managing complexity in larger systems.

Consequently, the combination of packages, blocks, actors, and value types accurately reflects the types of elements that can be included in a Package Diagram.