Which of the following is the MOST likely cause of the increased traffic?

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A technician notices that network access is becoming increasingly slow. All of the activity lights, on the only network layer 2 switch, are blinking at steadily increasing rates.

Which of the following is the MOST likely cause of the increased traffic?
A . STP blocking
B . IP addresses
C . MTU mismatch
D . Switching loop

Answer: D