I was attempting the online assessment (practice) based on SG 2020.
The question asked if "PO is the sole person who can manage PB"
I answered it false as my understanding is this responsibility can be delegated to anyone within or outside ST. The PO will however remain accountable.
Scrum says that there could be only 1 PO per product. Sometime the PO may have to go on Leave/Vacation so the product will not be stopped for that duration. So a person other than PO will be asked to backfill for PO and that person will be managing the PB.