The exhibit shows an interface configured as trusted for Dynamic ARP Inspection. In a normal access-layer design, trusted DAI ports are not user-facing ports. They are uplinks or infrastructure-facing links where valid ARP replies may arrive, typically toward a router, distribution switch, or another trusted network device. End-user devices such as PCs and ordinary DHCP clients should stay untrusted so the switch can validate their ARP traffic against the DHCP snooping binding database. If an untrusted host sends forged ARP information, DAI can drop it before it poisons neighboring hosts. That is why the device connected to FastEthernet0/1 is expected to be a router in this scenario. Cisco CCNA 200-301 v1.1 places this under IP Services and access-layer security behavior because DHCP snooping and DAI work together to protect Layer 2 addressing. The clue is the ip arp inspection trust interface setting. A trusted port should face infrastructure, not an endpoint, so C is correct.
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