At zero degrees angle of attack and positive velocity, a symmetrical airfoil will produce:

At zero degrees angle of attack and positive velocity, a symmetrical airfoil is designed in such a way that it doesn’t produce any lift under those conditions. However, it will still produce some drag due to skin friction and vortex shedding. The concept of induced drag comes into play when lift is generated; it is a byproduct of the downwash and vortex formation around the airfoil, which occurs when the angle of attack is positive and the airfoil generates lift.

Since a symmetrical airfoil at zero degrees angle of attack does not produce any lift, there is no induced drag resulting from the lift forces. Therefore, the correct answer highlights that induced drag is absent at this specific condition. Understanding this concept helps clarify the relationship between angle of attack, lift generation, and the associated types of aerodynamic drag.