PO or p.o.

I am wondering what the correct spelling is of this. Should it be PO (all caps) or is it small caps p.o.?

I want to type it correctly, but have seen it both ways.

Thanks

• PO or p.o. - Carla
  • p.o. is preferred, but client preference - dictates which way. (NM)
    • Thanks - Carla

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