You manage a large Consul datacenter and are hashicorp video

Full Certification Question

You manage a large Consul datacenter and are responsible for maintaining the Consul server nodes. A co-worker wants to deploy a new application that registers itself as a client so it can participate in service discovery. You provide a client configuration file, but you are worried that your co-worker might modify the configuration and try to start the Consul agent as a server, rather than a client. What configuration can you add to your Consul server agent configuration files to ensure this is not permitted?