Routers default behavior for mulitcast traffic

Hello,
What is router's default behavior (without enabling multicasting) for multicast traffic? Does it drop or look routing table and forward it?

Traditional IP communication allows a host to send packets to a single host (unicast transmission) or to all hosts (broadcast transmission). IP multicast provides a third scheme, allowing a host to send packets to a subset of all hosts (group transmission). These hosts are known as group members.

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