What should an identity architect recommend to optimize license usage and reduce maintenance overhead?

Universal Containers (UC) operates in Asia, Europe and North America regions. There is one Salesforce org for each region. UC is implementing Customer 360 in Salesforce and has procured External Identity and Customer Community licenses in all orgs.

Customers of UC use Community to track orders and create inquiries. Customers also tend to move across regions frequently.

What should an identity architect recommend to optimize license usage and reduce maintenance overhead?
A . Merge three orgs into one instance of Salesforce. This will no longer require maintaining three separate copies of the same customer.
B. Delete contact/ account records and deactivate user if user moves from a specific region; Sync will no longer be required.
C. Contacts are required since Community access needs to be enabled. Maintenance is a necessary overhead that must be handled via data integration.
D. Enable Contactless User in all orgs and downgrade users from Experience Cloud license to External Identity license once users have moved out of that region.

Answer: C