If a two-mass system is dynamically equivalent to a rigid body, then the system will not satisfy the condition that the

(a) Sum of the two masses must be equal to that of the rigid body

(b) Polar moment of inertia of the system should be equal to that of the rigid body

(c) Centre of gravity (c.g.) of the system should coincide with that of the rigid body

(d) Total moment of inertia about the axis through c.g. must be equal to that of the rigid body.