This is a tricky one. I'm going to go with B and C. Putting orphans in a leaf node might be a bit odd, but at least it keeps them contained. And assigning them to an existing root node is simple and straightforward.
Hmm, I'm leaning towards A and D. Creating a new root node for orphans could be a clean way to organize them, and using an expression to assign a parent seems flexible.
Option B and D are just weird. Who would want to assign orphan nodes to a leaf level or define them as additional root nodes? That just seems messy and illogical.
I think I'll go with option A and C. Assigning orphan nodes to a parent using an expression and to an existing root node seem like reasonable ways to handle them.
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