When a Force Is Called a "Normal" Force,it Is

When a force is called a "normal" force,it is

A) the usual force expected given the arrangement of a system.
B) a force that is perpendicular to the surface of the Earth at any given location.
C) a force that is always vertical.
D) a contact force perpendicular to the contact surfaces between two solid objects.
E) the net force acting on a system.

Correct Answer:

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