Thread:Project:Support desk/How can I made three wiki store and read image form same folder?

Now we have three language version wikis. We want to share images among three wiki and upload then to a common folder. How can I achieve that goal?

by $wgSharedTables[] = 'image'; and $wgUploadDirectory = "/commonfolder"; ?

by $wgForeignFileRepos?

or

by $wgUseSharedUploads?