Which command will rename action to Customer Action?

The command that correctly renames "action" to "Customer Action" is structured using the appropriate syntax for the rename function in Splunk. The correct usage of the rename command requires the use of "as" to indicate the new name being assigned, which in this case is "Customer Action."

The command effectively tells Splunk to take the existing field "action" and provide it with a new label, "Customer Action." The syntax of "rename fieldname as newname" is a convention within Splunk SPL that allows users to easily change field names for improved clarity or relevance in the results.

Using "as" ensures that the new field name is treated as a distinct entity, while including quotes around names that contain spaces ensures that the entire string is recognized correctly. Therefore, this command will successfully modify the field in the search results as intended.