Engineering Thermodynamics
Which of the following statement is correct according to Clausis statement of second law of thermodynamics?

It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
None of these

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Engineering Thermodynamics
An open system is one in which

Mass crosses the boundary but not the energy
Mass does not cross boundaries of the system, though energy may do so
Both energy and mass cross the boundaries of the system
Neither mass nor energy crosses the boundaries of the system

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