It might be good if there was a way of setting the Visible groups option in the Quiz to be a sub/hidden/advanced option because I suspect that for most people it is just a confusing distraction. I have been wondering what it meant for years.
Quiz
What does visible groups do to a quiz
Гэтае абмеркаваньне было заблакавана, таму вы болей ня можаце адказваць на яго.