Which of the following options represents the net force exerted on a stationary object?

• According to Newton's first law of motion, an object remains in the station of motion or rest unless acted upon by an external unbalanced force.
• Since the object is at rest, the external unbalanced force on the body must be zero. 
• Several forces may be exerted on a stationary object but they balance or cancel each other making the net external force zero.

Therefore, we can say that the net force exerted on a stationary object must be 0 N.