What Does the Word "Normal" Mean in the Phrase "Normal

Multiple Choice

What does the word "normal" mean in the phrase "normal force"?

A) the force that is usually exerted by a surface
B) the total force exerted by a surface
C) the component of the force exerted by a surface parallel to the surface
D) the component of the force exerted by a surface perpendicular to the surface
E) the force is due to contact between two objects.