Given the task definition, example input & output, solve the new input case.
In this task, you will be presented with a question in Dutch language, and you have to write the person names from the question if present. B denotes the first item of a phrase and an I any non-initial word. Phrase used for the person name - PER. There can be instances with no person name entity, then return 'None'.
Example: De belle van het bal is Hillary
Output: Hillary: B-PER, Clinton: I-PER
In the given sentence, Hillary is identified as the person name, which is correct.

New input case for you: Distributie-experts speculeren over toekomstige modellen voor e-business .
Output:
None