Option 3 is correct, i.e. Rolling friction is smaller than the sliding friction.
● The opposing forces that are experienced by objects when moving against each other are termed as friction.
● Static friction, sliding friction and rolling friction are the resistances experienced by stationary, moving and rolling objects respectively.
● Since static friction keeps an object stationary, it is the maximum.
● Rolling friction, on the other hand, provides the least resistance as the contact time and contact area between the two surfaces is the least.
Therefore, static friction is the strongest form of frictional force followed by sliding friction which is weaker than static but stronger than rolling friction.