Correct option is D
When forces
meet at a common point but their
lines of action lie in different planes, they are referred to as
non-coplanar concurrent forces.
Concurrent forces are forces that meet or act at a common point.
Non-coplanar forces refer to forces that do not lie in the same plane.
Therefore,
non-coplanar concurrent forces are those that intersect at a single point but are not confined to a single plane.
Thus, the correct answer is
(d) Non-coplanar concurrent forces.
