Given below are two statements related to Ellingham diagram:
Statement-$I$ : Ellingham diagrams can be constructed for formation of oxides,sulfides and halides of metals.
Statement-$II$ : It consists of plots of $\Delta_f H^0$ vs $T$ for formation of oxides of elements.
In the light of the above statements,choose the most appropriate answer from the options given below:

• A
  Both Statement $I$ and Statement $II$ are incorrect
• B
  Statement $I$ is incorrect but Statement $II$ is correct
• C
  Both Statement $I$ and Statement $II$ are correct
• D
  Statement $I$ is correct but Statement $II$ is incorrect