Customer 360 Data Manager is a platform service that enables companies to connect customer data across Salesforce apps and create a unified customer profile. It uses advanced matching algorithms to identify and link customer records from different systems based on common attributes such as name, email, phone, address, etc. It also assigns a consistent Global Party ID to each customer record, which serves as a unique identifier across systems. Customer 360 Data Manager can be used across multiple brands within a single merchant environment by creating separate data spaces for each brand. Option B is incorrect because Customer 360 Data Manager can relate the IDs between systems without additional custom development. Option C is incorrect because Customer 360 Data Manager supports multiple brands within a single merchant environment. Option D is incorrect because B2C Commerce, Service Cloud, and Marketing Cloud do not automatically use a common core Customer Profile managed by Customer 360 Data Manager; they need to be connected and configured via Customer 360 Data Manager. Reference:
https://www.salesforce.com/in/blog/2020/04/what-is-salesforce-customer-360.html
https://help.salesforce.com/s/articleView?id=sf.c360_overview.htm&type=5