In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?

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Question:
In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?

during high traffic periods
after broken links are re-established
when upper-layer protocols require high reliability
in an improperly implemented redundant topology
when a dual ring topology is in use

Explanation: If we connect two switches via 2 or more links and do not enable STP on these switches then a loop (which creates multiple copies of the same unicast frame) will occur. It is an example of an improperly implemented redundant topology.

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