UI Policies and UI Actionsare both part of theServiceNow user interface customizationbut serve different purposes.

Used todynamically change form field behaviorsbased on specific conditions.

Canmake fields read-only, mandatory, or hiddenwithout requiring scripts.

Runson the client-side (browser)to improve performance and responsiveness.

Example:

If theCategoryisHardware, theSerial Numberfield becomesmandatory.

Used tocreate buttons, links, and context menu actions.

Can executescriptsto perform specific actions when clicked.

Runs on theserver-side or client-sidedepending on configuration.

Example:

A"Save" buttonthat becomesvisible only to users with a specific role.

UI Policy(not UI Action) is responsible for making fieldsread-only, mandatory, or hidden.

UI Action(not UI Policy) is responsible for making aSave button visiblefor specific users.

ServiceNow Docs: UI Policy Overviewhttps://docs.servicenow.com/en-US/bundle/utah-platform-administration/page/administer/form-administration/concept/c_UIPolicies.html

ServiceNow Docs: UI Action Overviewhttps://docs.servicenow.com/en-US/bundle/utah-platform-administration/page/administer/form-administration/concept/c_UIActions.html

UI Policy:UI Action:Why Option A is Incorrect?References from Certified System Administrator (CSA) Documentation: