Administrator and People Manager roles manage federation but use local ABM/ASM credentials. The Apple Business Manager User Guide states, "Administrators and People Managers can configure and manage the federation process in Apple Business Manager or Apple School Manager, but their accounts remain local and cannot sign in using federated authentication." Options C, D, and E lack these permissions or are not relevant roles for federation management.
Reference:
Apple Business Manager User Guide, "Roles and Federated Authentication" section.
Apple Platform Deployment Guide, "Identity Management Roles" section.