A large multinational company's IT system needs to use AD. Regarding the planning of AD, which of the following descriptions is incorrect?
A. Within each subdomain and between different departments, different users and devices can be managed separately by setting different 0Us
B. According to the different regions of the department, establish different sub-domains, but there should be as few sub-domains as possible
C. There is no need to synchronize user data between different subdomains
D. Adopt multi-domain deployment, different regions have different sub-domain strategies, management, maintenance, and deployment are more complicated than a single domain