Which relation is the basis of Mollier Diagram?

A

$$c_p = \left(\frac{\partial h}{\partial T}\right)_P$$

B

$$c_v = \left(\frac{\partial Q}{\partial T}\right)_v$$

C

$$c_p - c_v = R$$

D

$$T = \left(\frac{\partial h}{\partial S}\right)_P$$