I want to know the answer to the following question:
Who confirmed the elevation of the Dukes of Brunswick-Lüneburg in 1708?
All the background I'm provided with is that "The Dukes of Brunswick-Lüneburg were elevated by the Holy Roman Emperor to the rank of Prince-Elector in 1692, and this elevation was confirmed by the Imperial Diet in 1708.". Is that enough to answer the question?
Answer: yes