I want to know the answer to the following question:
Who is customarily divided along geographical lines into tree major subgroups?
All the background I'm provided with is that "Slavs are customarily divided along geographical lines into three major subgroups: West Slavs, East Slavs, and South Slavs, each with a different and a diverse background based on unique history, religion and culture of particular Slavic groups within them.". Is that enough to answer the question?
Answer: yes