A collaboration engineer adds a voice gateway to Cisco UCM. The engineer creates a new gateway device in Cisco UCM, selects VG320 as the device type, and selects MGCP as the protocol. What must be done next to add the gateway to the Cisco UCM database?

A. Select a device pool for the new gateway. B. Add the FQDN or hostname of the device. C. Configure the module in slot 0 of the new gateway. D. Select the DTMF relay type for the gateway.