Control Systems
Lowest critical frequency is due to pole and it may be present at the origin or nearer to the origin, then the type of network is

 Any of the above.
 LC.
 RC.
 RL.

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Control Systems
When deriving the transfer function of linear element

 both initial conditions and loading are taken into account.
 initial conditions are assumed to be zero but loading is taken into account.
 initial conditions are assumed to be zero and the element is assumed to be not loaded.
 initial conditions are taken into account but the element is assumed to be not loaded.

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