What elements are part of the official BPMN 2.0 notation?

The correct choice reflects the key components of the Business Process Model and Notation (BPMN) 2.0 standards used for modeling business processes. Within this standard, "Pool" and "Lane" represent essential elements for defining participants in a process and organizing activities within those participants.

Pools are used to separate different organizations or entities involved in a process, while Lanes further categorize specific responsibilities within a Pool, allowing for a clearer structure in a process diagram. This modular approach enhances the visualization of how different roles interact and contribute within the overall process, making it easier for stakeholders to understand and analyze workflows.

On the other hand, "Additional Participant," "Task," and "IT-Systems" do not fully align with the standardized elements as per BPMN 2.0. While a Task is indeed a recognized component of BPMN, it does not encompass the organizational capabilities that Pools and Lanes provide. The term "Additional Participant" is not an official BPMN element, and "IT-Systems" are not directly part of the BPMN notation but can be relevant in the context of process execution.