Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?

Question

SCN^{$ - $} < F^{$ - $} < CN^{$ - $} < C₂O₄^2-

F^{$ - $} < SCN^{$ - $} < C₂O₄^2- < CN^{$ - $}

CN^{$ - $} < C₂O₄^2- SCN^{$ - $} < F^{$ - $}

SCN^{$ - $} < F^{$ - $} < C₂O₄^2- < CN^{$ - $}

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