Which of the following Is MOST likely the issue?

A department is reporting network Issues. Users can ping each other and the switch, but not the default gateway. When looking at a wiring diagram and a physical blueprint, a technician notices the 1000BaseLX SFP connects to a distribution switch via a cable that runs behind a large Industrial refrigerator. The technician also notices both switches have been worked on recently .

Which of the following Is MOST likely the issue?
A . EMI
B . TX/RX reverse
C . Open/short
D . Attenuation

Answer: A