I want to know the answer to the following question:
What league can compete?
All the background I'm provided with is that "The competition is open to any eligible club down to Levels 10 of the English football league system - all 92 professional clubs in the Premier League and Football League (Levels 1 to 4), and several hundred "non-league" teams in Steps 1 to 6 of the National League System (Levels 5 to 10).". Is that enough to answer the question?
Answer: yes