What happens next?

How to make thin european style pancakes
Crack the eggs into a mixing bowl and beat them until the yolks and the whites are blended together.
Add the milk and whisk until it's mixed together with the eggs.
Slowly add the flour whisking thoroughly after every 1/4 cup.

pick from the following.
(I). If there are lumps, use a mixer to break them down. Cover the inside of the pan with butter/cooking oil.;
(II). Mix again until there is a thin film formed at the bottom of the pan that the egg yolks and whites blend in. Add the oil in the other pan.;
(III). Pour the water into a heat-proof bowl and beat for about 3 seconds until the egg whites are added. Slowly pour and whisk in the water.;
(IV). Pour in the eggs and whisk them until they're thoroughly blended and the flour is thoroughly incorporated in the mixture. Slowly add the dry ingredients and stir, the mixture will continue to pour the mix after every 1/4 cup.;
(I).