What is the correct order of $C-O$ stretching frequency of the following compounds:

$[V(CO{)}_6{]}^{-},Cr(CO{)}_6,[Co(CO{)}_6{]}^{3+},[Mn(CO{)}_6{]}^{+}$

$[Mn(CO{)}_6{]}^{+}>[Co(CO{)}_6{]}^{3+}>Cr(CO{)}_6>[V(CO{)}_6{]}^{-}$

$[Co(CO{)}_6{]}^{3+}>[Mn(CO{)}_6{]}^{+}>Cr(CO{)}_6>[V(CO{)}_6{]}^{-}$

$[Mn(CO{)}_6{]}^{+}>[Co(CO{)}_6{]}^{3+}>Cr(CO{)}_6>[V(CO{)}_6{]}^{-}$

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