What function does a connector serve in an IBD?

In the context of an Internal Block Diagram (IBD), a connector plays a crucial role in illustrating the interactions between different parts of a system. It effectively shows how internal properties of the system link with external entities or components, thereby providing a visual representation of the relationships and flow of information or control. This is vital for understanding the dynamics and interactions within the system architecture, allowing for clearer communication of how various elements work together.

Now, considering the other possible choices, the option that defines interfaces between systems focuses more on external interactions rather than internal dynamics. While connections among internal and external properties definitely highlight the nuances of these relationships, simply defining interfaces would fall short of capturing the totality of interactions depicted by connectors in an IBD. Similarly, representing the structure of the entire system pertains more to the overall organization and does not emphasize the specifics of how different components connect via connectors. Lastly, while displaying the system's services and functions is relevant in illustrating capabilities, it does not address the specific role that connectors play in linking properties within the system. Therefore, options that focus more on either interfaces or overall structure miss the particular emphasis that connectors in an IBD offer regarding internal and external property relationships.