Which of the following is correct order of ligand field strength?

According to spectrochemical series, ligands can be arranged in a series in the order of increasing field strength as given below: 

$\mathrm{I}{ }^{–} < {\mathrm{Br}}^{–} < \mathrm{SCN}{ }^{– } < \mathrm{Cl}{ }^{–} < {\mathrm{S}}^{2–} < \mathrm{F}{ }^{–} < \mathrm{OH}{ }^{–} < {\mathrm{C}}_2\mathrm{O}4{ }^{2–} < {\mathrm{H}}_2\mathrm{O} < \mathrm{NCS}{ }^{–} < {\mathrm{edta}}^{4–} < {\mathrm{NH}}_3 < \mathrm{en} < \mathrm{CN}{ }^{–} < \mathrm{CO}$

As per the above series, correct answer is ${\mathrm{S}}^{2-}<{\mathrm{C}}_2{\mathrm{O}}_4^{2-}<{\mathrm{NH}}_3<\mathrm{en}<\mathrm{CO}$