When using Group Policy Preferences to deploy a File item, what does the "Update" action do?

When using Group Policy Preferences to deploy a File item, what does the "Update" action do?

• Creates the file if it does not exist. Updates the file content and attributes if it does.
• Updates the file attributes if the file exists. Does nothing if the file does not already exist.
• Creates the file if it does not exist. Updates the file attributes (but not content) if it does.
• Updates the file content if the file exists. Does nothing if the file does not already exist. 

 

EXPLANATION

The Update action has the following behavior when used to configure a File item in Group Policy Preferences:
Modify settings of an existing file (or multiple files in one folder) for computers or users. This action differs from Replace in that it only updates file attributes defined within the preference item. All other file attributes remain as configured on the file. If the file does not exist, then the Update action copies the file from the source location to the destination.
From TechNet - Configure a File Item