A network engineer is configuring an Internet of Things (IoT) network that uses multicasting to allow devices to communicate over a VLAN-enabled managed switch. An issue is occurring where the multicast traffic is being flooded across the network as a broadcast, resulting in reduced network performance. Recommend a potential fix for this issue. A.Enable DHCP Relay B.Ensure DHCP server is correctly configured C.Ensure DNS server is properly configured D.Ensure IGMP snooping is enabled at the switch