\( W \) is the amount of work done by the system and \( q \) is the...

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\( W \) is the amount of work done by the system and \( q \) is the amount of heat supplied to the system. Choose the correct option for the change in internal energy and type of a system from the given options respectively.
(a) \( \Delta U=W_{\text {ad }} \), adiabatic system
(b) \( \Delta U=-q \), open system
(c) \( \Delta U=q-W \), closed system
(d) None of the above
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