Which of the following statements about Ellingham diagram are true?
i) Ellingham diagram normally consists of plots of `Delta_(f)G^(@)` Vs T for formation of oxides of elements
(ii) Each plot will be straight lines at all temperatures
iii) There is a point in a curve below which `DeltaG` is -ve and above this point the oxide decompose its own
iv) Ellingham diagram is restricted to metal oxides
v) Ellingham diagram does not say about kinetics of the reduction process
vi) Ellingham diagram presumes that the reactants and products are in equilibrium

Options

A. A. All are true
B. AII except iv are true
C. C. All except iv and vi are true
D. D. All except iv are true