Which two design elements are required to ensure all authentication methods are highly available?

An architect is planning for a cloud-hosted implementation of VMware Identity Manager to integrate with an existing implementation of Workspace ONE UEM. The solution will include the following authentication methods:
Username/Password (Cloud Deployment)
VMware Verify
RADIUS (Cloud Deployment) Device Compliance
Workspace ONE UEM is also cloud hosted, however, the Active Directory and RADIUS servers are deployed on-premises.
Which two design elements are required to ensure all authentication methods are highly available? (Choose two.)
A. IdP Hostname set to load-balancer FQDN
B. Connectors configured for Legacy Mode
C. Enable Redirect configured on each Connector
D. Associate connectors with Build-In IdP
E. Enable authentication methods on all connectors