Final answer:
The statement is true; disparate IDs must be manually linked for Contact Visualizer to work across different platforms, as Marketing Cloud does not automatically unify these IDs.
Step-by-step explanation:
The statement is True: You must manage the linking of disparate IDs for Contact Visualizer to function across Studios/Builders; Marketing Cloud does not do this automatically. The Contact Visualizer is a tool that helps visualize customer interactions and paths through different channels and campaigns within the Salesforce Marketing Cloud. Because customers can have different IDs across systems (such as email ID, phone number, or social media ID), it is important to merge or link these disparate customer identifiers. This process is not automatic and requires configuration and management to ensure that the Contact Visualizer has a unified view of the customer's interactions.