If ΔU and ΔW represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?

ΔU = – ΔW, in a isothermal process ΔU = – ΔW, in a adiabatic process ΔU = ΔW, in a isothermal process ΔU = ΔW, in a adiabatic process

ΔU = – ΔW, in a adiabatic process

In an adiabatic process Q=0  ⇒ ΔU + ΔW = 0 ⇒  ΔU = -ΔW