What are the authentic traditional ingredients for Naan bread?

What are the authentic traditional ingredients for Naan bread?

I would like to know what the authentic and traditional ingredients for
Naan bread are. There are many recipes that use some ingredients but not
others and the cooking method are not always the same. These are the
ingredients which usually differ from what I have seen:
Milk
Yogurt
Water
Baking Powder
Yeast
Eggs
This recipe here does not use yogurt, this one here uses no baking powder
or milk or yogurt, this one here uses no baking powder or yogurt. I can
understand substitutions and variations, but I would like to know how it
is originally made and what the ingredients are.
Also the cooking method varies. Some use a pan to fry the Naans prepared,
some use only the oven, and some use the oven and then are grilled at the
end for a short time.