The (T d S) equation (T d S=C_{P} d T-Tleft(frac{partial V}{partial T} ight)_{P} d P) is valid

The \(T d S\) equation \(T d S=C_{P} d T-T\left(\frac{\partial V}{\partial T}\right)_{P} d P\) is valid where entropy is a function of

(a) \(T\) and \(P\)

(b) \(P\) and \(V\)

(c) \(T\) and \(V\)

(d) None of these.