Which statement describes a MAC address table overflow attack?

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Which statement describes a MAC address table overflow attack?

Frames flood the LAN, creating excessive traffic and degrading network performance.
A software tool floods a switch with frames containing randomly generated source and destination MAC and IP addresses
An attacker alters the MAC address in a frame to match the address of a target host.
The attacking host broadcasts STP configuration and topology change BPDUs to force spanning-tree recalculations.