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Option 2 : Isolated system
Explanation:
Closed System: There is no mass transfer across the system boundary but energy transfer takes place into or out of the system.
Open System: In this type of system both mass and energy transfer takes place across the boundary of the system.
Isolated System: In this type of system neither mass nor energy crosses the boundary of the system.
In the case of well-insulated Thermo flask, there is no exchange of mass and energy with the surroundings. So this becomes an isolated system.
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