Which of the foolwing best define net force?

Net force can be defined as the sum of force acting on an object in all the directions

. i. e Net force = F acting on a body at upward direction + F at downward direction + F at leftward direction + F at rightward direction.

e. g if a body is at rest the sum of forces acting on body in all direction is zero

but if a body is moving its mean body is facing an unbalanced net force.