Poorly worded question.
What types of traffic will a switch flood out all ports?
Broadcast and multicast frames, as well as unicast frames to unknown destinations, are normally flooded to all ports in a basic switch, and all of this traffic will circulate in such a loop.
Flooding means that the switch sends the incoming frame to all occupied and active ports (except for the one from which it was received). In essence, flooding is when a switch pretends to be a hub.
since there is no option to select a broadcast or multicast it can only be assumes that Cisco is referring to option b as no other option can create a "flooding"
Flooding vs Broadcast - Cisco Community
Post by Kristian Alexander Brown
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Flooding is sometimes known as an unknown unicast. This happens when a switch receives a frame with a destination mac address it does not have in the CAM table. It will flood it out all ports except the receiving port of the frame.
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