An architect is designing a new vSphere platform for a customer to meet the following requirements:
The platform must be deployed into five physically separate sites.
The sites are spread across multiple regions.
Some sites require more than one vCenter Server.
The platform must provide an administrator with the ability to access virtual infrastructure components across all sites from a single management tool instance.
Which single sign-on (SSO) design recommendation will meet these requirements?
A. Use an SSO domain across all vCenter Server instances
B. Use an SSO domain per region
C. Use an SSO domain per vCenter Server instance
D. Use an SSO domain per site
