How does Chef configuration management enforce a required device configuration?

How does Chef configuration management enforce a required device configuration?

A. The Chef Infra Server uses its configured cookbook to push the required configuration to the remote device requesting updates. B. The installed agent on the device connects to the Chef Infra Server and pulls its required configuration from the cookbook. C. The Chef Infra Server uses its configured cookbook to alert each remote device when it is time for the device to pull a new configuration. D. The installed agent on the device queries the Chef Infra Server and the server responds by pushing the configuration from the cookbook.