Master/Core data in ServiceNow refers to the foundational data that is essential for the platform's operation and various applications. This includes:

A. Approval Policies: These define the rules and workflows for approvals within the platform, impacting various processes.

C. CMDB data: The Configuration Management Database (CMDB) contains critical information about IT assets, services, and their relationships.

E. User information: Data about users, their roles, and their permissions is crucial for access control and security.

Why not the other options?

B. Transaction logs: These are operational data that record system activities, not core master data.

D. Service model data: While important, service model data is typically built upon the foundation of master data like the CMDB and user information.