which preposition should i use in the below sentence
that will provide the optimal to maintenance one version at all territories
at all territories or in all territories or for all territories
another question which one is correct : optimal or optimum

Question

which preposition should i use in the below sentence
that will provide the optimal to maintenance one version at all territories
at all territories or in all territories or for all territories
another question which one is correct : optimal  or optimum

Answer

acually you  need to reconstruct your sentence and to give some information before (that  will provide ) 
so depending in the context we can suggest in all or at all because it highly depend in that and both are right for some thing. Eg
we will  provide maintaince service for all territories.

and for optimum and optimal they are partialy interchanchable 
both can be used as adjective but  more with optimal while as a noun only optimum work. 
we will provide maintaince office at all territories