I want to know the answer to the following question:
To which century do some researchers attribute the Bergakker inscription?
All the background I'm provided with is that "Although some placenames recorded in Roman texts could arguably be considered as the oldest "Dutch" single words, like vadam (modern Dutch: wad, English: "mudflat"), the Bergakker inscription yields the oldest evidence of Dutch morphology, but there is no consensus on the interpretation of the rest of the text.". Is that enough to answer the question?
Answer: no