Which definition of propeller parameters is correct? - ATPL

Question id 302 - Principles of Flight - ATPL - Airline Transport Pilot license

Blade angle is the angle between the blade chord line and the propeller axis

Angle of attack is the angle between the blade chord line and the propeller vertical plane

Geometric pitch is the theoretical distance a propeller blade element would travel in a forward direction during one revolution

Critical tip velocity is the propeller speed at which flow separation first occurs at some part of the blade