Which feature should an administrator use to fulfill this request?

Ursa Major Solar has a path on Case. The company wants to require its users to follow the status values as they are on the path. Agents should be prohibited from reverting the Case back to a previous status.

Which feature should an administrator use to fulfill this request?
A . Predefined Field Values
B . Global Value Picklists
C . Dependent Picklists
D . Validation Rules

Answer: D