What does a node label provide in a project activity diagram?

In a project activity diagram, a node label serves as the unique identifier for every activity within the project. This is essential for tracking and managing each activity, as it allows team members and stakeholders to reference specific tasks consistently. A unique identifier in a project context helps prevent confusion, especially when multiple activities may have similar names or when the project involves many interconnected tasks.

Utilizing unique identifiers ensures that each activity can be distinctly recognized, facilitating better communication and coordination among team members. It assists in project management tools where activities are monitored, reported on, and referenced in discussions or documentation.

The other options relate to important project management concepts but do not accurately describe the purpose of node labels within a project activity diagram. For example, estimated time for completion, budget allocations, and dependencies are critical aspects in project planning but serve different functions than the identification provided by node labels.