In the world of IP Multicast, the address range is strictly categorized by the IANA. Understanding these boundaries is a core requirement for the ACP-S switching exam.

Link-Local Multicast (224.0.0.0/24): The address used in the scenario, 224.0.0.100 , falls within the " Local Network Control Block " (224.0.0.0 to 224.0.0.255). These addresses are reserved for protocol traffic that is intended to stay within a single broadcast domain (Layer 2). Examples include OSPF (224.0.0.5) and RIPv2 (224.0.0.9).

The Routing Restriction: By design and industry standard, Layer 3 switches and routers do not forward traffic addressed to the 224.0.0.0/24 range. This is a hard-coded behavior to prevent control plane protocols from leaking into other parts of the network. Even if you enable PIM (Protocol Independent Multicast) and IGMP on all SVIs, the switch will drop these packets at the Layer 3 boundary.

The Solution: To route multicast traffic between VLAN 100 and VLANs 200/300, the application must use a group address from the administratively scoped or globally scoped ranges (e.g., 239.0.0.0/8 or 224.0.1.0 and above).

Why Option D is insufficient: While enabling IGMP and PIM on the SVIs is a necessary step for routable multicast, it will not overcome the fundamental architectural block placed on the 224.0.0.0/24 link-local range.