What transaction do you have to use to map a back-end system to one of those roles?

You want to create an SAP Fiori app for multiple users and multiple back-end systems. To support this, you create different roles for the different back-end systems in the SAP Fiori front-end system (central hub) .

What transaction do you have to use to map a back-end system to one of those roles?
A . /UI2/GW_SYS_ALIAS
B . PFCG
C . SM59
D . /IWFND/MAINT_SERVICE

Answer: B