I've read the Scrum - A Pocket Scrum guide. There is small chapter which writing about multiple teams working in Scrum.
The multiple Scrum teams working on one Product Backlog. Each team needs to have Product Owner, Scrum Master and Development Team.
I have a question: If multiple teams are working on one product backlog
should there be multiple Product Owners, one for eacht Scrum Team?
Or should there be only one Product Owner for all Scrum Teams?