C is definitely the right answer. The types have to match perfectly, no exceptions. Anything else would just cause problems in the Order Management system.
Haha, I bet the exam writers are trying to trick us with these options. I'm going with D - the names must only contain letters and underscores. That sounds like the kind of random requirement they'd throw in there.
I think the correct answer is C. The types must be an exact match, like String to String. That's the most important thing for mapping custom attributes into Order Management.
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