Your customer wants to change the way Priority on Problem records is calculated based on Impact and Urgency. Which module should you use to locate and update the Priority Problem Lookup record?

Priority Matrix is not a standalone module name in ServiceNow - the actual configuration is managed through Data Lookup Definitions, not a module called Priority Matrix.

Choice Lists are used to manage the available options in dropdown fields, not to define calculation logic for how one field's value is derived from others.

Data Lookup Definitions (found under System Policy > Data Lookup Definitions) is the module that stores lookup rules including the Priority lookup table, which maps combinations of Impact and Urgency values to a resulting Priority value for records such as Problem, Incident, and others. Updating the Priority Problem Lookup record here changes how Priority is automatically calculated.

Priority Rule Definitions is not a standard ServiceNow module name for managing priority calculation logic.