For a process which is non-flow (U is the internal energy, Q is the heat and W is the work done) the first law of thermodynamics states ________.

A

$$\partial U =\partial Q-\partial W $$

B

$$ \oint dQ + \oint dW =0 $$

C

$$ \oint dQ \neq \oint dW $$

D

$$ \partial U =\partial Q $$