The correct response is C and E. A Cisco router acting as a DHCP server must have a DHCP address pool and can use manual bindings when specific addresses must be reserved. The pool defines the scope of addresses and options that clients receive; bindings tie a known client identifier or MAC-related value to an address when deterministic assignment is required. For Cisco CCNA 200-301 v1.1, the important point is the mechanism, not a generic description of the technology. Relay-agent information and smart-relay support relay behaviour, and a database agent is optional persistence rather than the core server configuration being tested. When this appears in a network, the symptom normally confirms the answer: the route installed, the state selected, the packet forwarded, the wireless client behaviour, or the management workflow will follow this rule. That is why this answer is the best fit for the scenario and not just a plausible networking term.