Refer to the exhibits.

The Enterprise Firewall 7.6 Administrator Study Guide explains: “The root FortiGate acts as the identity provider (IdP) and you configure the other devices as service providers (SP).” Therefore, the root FortiGate authenticates the credentials for the AdminSSO administrator, while the downstream FortiGate operates as the SAML service provider.

After successful authentication, the root FortiGate returns a SAML assertion to the downstream FortiGate. The downstream device then grants access according to its configured SAML administrator profile. The exhibit shows that its Default admin profile is super_admin_readonly. Consequently, the user is logged in to the downstream FortiGate with read-only super-administrator privileges.

The browser can be redirected temporarily to the root FortiGate for identity-provider authentication, but that is not the final access outcome, so option A is incomplete. AdminSSO is the administrator account name, not an access profile, and the user is not left on the root FortiGate, eliminating option C. Because the credentials are successfully authenticated, option D is also incorrect.