Final answer:
The default identity sources after installing vCenter are vsphere.local and localos, with vsphere.local being the default SSO domain and localos referring to the local server's users and groups. The correct options are d and e.
Step-by-step explanation:
After installing vCenter, the two identity sources and users available by default are vsphere.local and localos. The vsphere.local is the default Single Sign-On (SSO) domain that is created during the installation of vCenter Server. All users and groups created within this domain are known as SSO users.
On the other hand, localos refers to the local users and groups on the server where vCenter Server is installed, which can also be used to log in to the vCenter Server. This does not include other identity sources like Active Directory until they are configured manually after installation.
The correct options are d and e.