How does Cisco DNA Center gather data from the network?

A. Devices use the call-home protocol to periodically send data to the controller
B. Devices establish an IPsec tunnel to exchange data with the controller
C. The Cisco CLI Analyzer tool gathers data from each licensed network device and streams it to the controller
D. Network devices use different services like SNMP, syslog, and streaming telemetry to send data to the controller