Question: At which OSI model layer do routers primarily operate? Physical Transport Data Link Network Which statement best describes what happens to frames when a hub

At which OSI model layer do routers primarily operate?
Physical
Transport
Data Link
Network
Which statement best describes what happens to frames when a hub sends them to the NICs on the network?
The frames are sent only to the NIC that has the destination MAC address
The frames are received by every NIC, but only the NIC with the matching MAC address processes the frame
Every NIC processes the frame when it receives it.
The NIC broadcasts the contents of the frame.

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