Viewing/checking out old revisions of drawings and their parts

Ok, so I have a part that is up to Rev J and a drawing of it which is up to Rev C.  I want to view Rev B of the drawing.  When I check the drawing out of the vault I choose rev B for the drawing and What do I choose for the Rev of the part?  And what do i select in the "As built , latest revision or latest available revision" area?  I can't find this explained clearly anywhere.

SolidworksWorkgroup Pdm