Okay, let's see. I think the key here is understanding the concept of non-substitutability between a parent and child classifier. I'll review my notes on that.
Substitutability, the bane of every software architect's existence. At least this question isn't asking about the Observer pattern - now that's a real headache!
I think it's C. The property 'isSubstitutable' being set to false would indicate that the child can't be substituted for the parent. Seems pretty straightforward to me.
Keith
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