This seems straightforward to me. The key purpose of an ERD is to define the entities and their relationships in a system, which is exactly what option D describes. I'll go with that one.
I'm a little confused by the wording of the question. The options don't seem to directly match what I know about ERDs. I might have to review my notes to make sure I'm understanding this correctly before answering.
Okay, I've used ERDs before in my database design courses, and I'm pretty confident that D is the right answer here. ERDs show the entities involved in a process and how they're connected.
Hmm, I'm a bit unsure about this one. I know ERDs are used to model data and relationships, but I'm not totally sure if that matches up with the options here. I might have to think this through a bit more.
Martin
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