Which two are valid Identity Sources when configuring vCenter Single Sign-On? (Choose two.)

Radius is not a supported identity source type in vCenter SSO - the supported types are Active Directory (IWA or LDAP), OpenLDAP, and LocalOS.

NIS (Network Information Service) is not among the supported identity source types in vCenter SSO and cannot be configured as an identity provider.

OpenLDAP is a supported identity source type in vCenter SSO, allowing organizations to authenticate users against an OpenLDAP-compatible directory server using standard LDAP queries.

LocalOS is a built-in identity source in vCenter SSO that enables authentication using the local operating system accounts on the SSO server itself, and is always present as a default source.