How to tag a group of stations?

How do I tag a railway station with 2 bus stations, all of which are clustered together? I read the wiki but it is unclear. There are several ways and it does not say how they interact. Should I use railway=station and amenity=bus_stop or a single public_transport=station or 3 different public_transport=station? Should I use a public_transport relation?

Yes, a relation public_transport=stop_area_group is specified in the Wiki for this purpose.

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