Newton’s first law of motion : It is also called the law of inertia. Inertia is the ability of a body by virtue of which it opposes a change.
According to Newton’s first law of motion, an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
The inertia of rest: When a body is in rest, it will remain at rest until we apply an external force to move it. This property is called inertia of rest .
The inertia of motion: When a body is in a uniform motion, it will remain in motion until we apply an external force to stop it. This property is called inertia of motion.
EXPLANATION
Newton's first law of motion is also called the law of inertia . So option 3 is correct.