Withthe CloudBees Folders Plus plugin, which step is required to configure a controlled agent?

The folder administrator sends an email, containing the folder ID, to the agent administrator, who adds the ID to the list of approved folders.

Anyone with admin permissions can simply be the ID of the folder to the specific agent; no other steps are necessary.

The folder administrator sends a request, containing a digital signature, to the agent administrator, who adds the signature to the list of approved signatures.

The folder administrator creates a request key which is given to the agent administrator, who approves the request key and sends back a request secret.