Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

None of the listed here
Vary with the configuration of the mechanism
Remain in the same place for all configurations of the mechanism
Moves as the mechanism moves, but joints are of permanent nature

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Theory of Machine
A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

All of these
The sum of mass moment of inertia of the masses about their center of gravity is equal to the mass moment of inertia of the body
The sum of the two masses is equal to the total mass of body
The center of gravity of the two masses coincides with that of the body

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