Which one among the following is correct for resultant of balanced forces ?

In Newtonian mechanics, forces are described as balanced when the vector sum of all individual forces acting on an object is zero [t3][t4]. This vector sum is commonly referred to as the 'net force' or 'resultant force' [t5][t7]. When the resultant of forces is zero, the object is in a state of equilibrium, meaning it will either remain at rest or continue to move with a constant velocity in a straight line [t1][t2]. For example, a book resting on a table experiences a downward gravitational force that is exactly balanced by an upward normal force, resulting in a net force of zero [t2][t7]. Conversely, if the resultant force were non-zero, the object would undergo acceleration in the direction of that net force [t1][t5]. Therefore, the defining characteristic of balanced forces is that their resultant is zero [t5][t6].

Sources

1. [1] https://sathee.iitk.ac.in/article/physics/physics-balanced-force/
2. [2] https://www.grc.nasa.gov/www/k-12/airplane/equilib.html