What is the difference between a UI Policy and Data Policy?

What is the difference between a UI Policy and Data Policy?
A . Data Policies run when data is entered through the form, by an Import Set, or by web services, while UI Policies are set only by web services
B . Data Policies can be converted into UI Policies, but UI Policies cannot be converted into Data Policies
C . Data Policies run regardless of how data is entered into ServiceNow, while UI Policies are used for form interactions
D . Data Policies run only after UI Policies run successfully

Answer: C