A client experiences slow throughput from a server that is directly connected to the core switch in a data center.
A network engineer finds minimal latency on connections to the server, but data transfers are unreliable, and the output of the show interfaces counters errors command shows a high FCS-Err count on the interface that is connected to the server. What is the cause of the throughput issue?

A. a physical cable fault
B. a speed mismatch
C. high bandwidth usage
D. a cable that is too long