I'm working toward an F&O cert and there's this study page on EDTs:
Elsewhere there is a sample question that goes like this:
It appears that D is the correct answer, which I agree with. But I don't understand why B is not an equally correct answer. According to the official learn.microsoft.com page linked above, DERIVED EDTs can in fact be created, and then modified as needed. Here is the exact text from that page:
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Note
Instead of extending an existing EDT, you can create a new one, deriving it from the existing EDT. This allows you to edit more properties than you could edit using the extension approach. This means that you would need to modify the fields using this EDT to use your new EDT.
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To me, both B and D are correct. So...why only D. Why is B incorrect?