ServiceNow Certified System Administration Practice

The primary purpose of an Update Set in ServiceNow is indeed to move customizations from one instance to another. Update Sets serve as a way to package and transfer application customizations—such as changes to forms, fields, business rules, and other configurations—between different ServiceNow instances. This is particularly beneficial for environments that use a development, test, and production workflow, allowing changes made in a lower environment to be safely and systematically applied to a higher environment.

In the context of your options, while organizing change requests, tracking incidents, and validating scripts are important functionalities within ServiceNow, they do not pertain to the specific role of Update Sets. Instead, Update Sets streamline the migration of configurations to ensure that developments are fully integrated into production environments without conflicts or oversights. Thus, the definition and utility of Update Sets position option B as the correct choice.