Refer to the exhibit. Site A was recently connected to site B over a new single-mode fiber path. Users at site A report intermittent connectivity issues with applications hosted at site B. What is the reason for the problem?

A. Physical network errors are being transmitted between the two sites.
B. Heavy usage is causing high latency.
C. The wrong cable type was used to make the connection.
D. An incorrect type of transceiver has been inserted into a device on the link