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

Radius is a network access authentication protocol, not a supported identity source type in vCenter Single Sign-On configuration.

NIS (Network Information Service) is not a supported identity source type in vCenter SSO - it is not listed among the configurable identity source options.

OpenLDAP is a supported identity source type in vCenter SSO, allowing authentication against any OpenLDAP-compatible directory by specifying the server URI, base DN, and bind credentials in the identity source configuration.

LocalOS is a supported identity source in vCenter SSO that enables authentication using local operating system accounts on the vCenter Server host, useful for initial access or environments without a directory service.