What types of boundary layers can be found on an aerofoil?

Question

PPL(A) - Private Pilot License - Principle of Flight - What types of boundary layers can be found on an aerofoil?

QuizVDS · Accepted Answer

Laminar layer at the leading wing areas, turbulent boundary layer at the trailing areas

QuizVDS · Answer

Turbulent boundary layer along the complete upper surface with separated airflow

QuizVDS · Answer

Turbulent layer at the leading wing areas, laminar boundary layer at the trailing areas

QuizVDS · Answer

Laminar boundary layer along the complete upper surface with non-separated airflow

PPL(A) EN: What types of boundary layers can be found on an aerofoil?