Which of the following statements is true? ($\Delta U = \text{increase in internal energy}$,$dW = \text{work done by the system}$)
- AIn an adiabatic process $\Delta U = dW$
- BIn an adiabatic process $\Delta U = -dW$
- CIn an isothermal process $\Delta U = -dW$
- DIn an isothermal process $\Delta U = dW$
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