Choose the correct answer:Which statement is correct about an Activity Parameter Node?

Here's a breakdown of why option A is correct and why the other options are not:

Activity Parameter Nodes:

Object Nodes: Activity Parameter Nodes are specialized Object Nodes in UML activity diagrams. They provide a mechanism to pass inputs to an activity or receive outputs from an activity.

Parameters: They represent parameters connected to the activity.

Analysis of Other Options

B. It is used to model a data store: Data stores are distinct modeling elements, often used in combination with Activity Parameter Nodes. An Activity Parameter Node itself does not represent a persistent data store but rather an entry or exit point for data in the flow of an activity.

C. It is equivalent to an action input or output pin: While similar in concept, Activity Parameter Nodes are a distinct modeling element with additional properties. Action input/output pins are part of the structured actions within an Activity. Activity Parameter Nodes function on the boundary of the Activity itself.

D. It can hold only input parameters, not output parameters: Activity Parameter Nodes can represent both input and output parameters. The direction (in, out, inout) is a property of the Parameter associated with the node.

References

UML 2.5.1 Specification (Superstructure): Sections on Activity Diagrams, Object Nodes, Activity Parameter Nodes and Parameters. https://www.omg.org/spec/UML/2.5.1