A distribution layer switch with an SC GBIC that has a fiber connection back to the core has
gone bad and needs to be replaced with a newer model and an LC GBIC. The fiber patch
cable was replaced with a known good LC patch cable. After replacing the switch, the fiber
connection shows no link. Which of the following is MOST likely the cause of the problem?

A.
DB loss

B.
Incompatible GBIC

C.
TXRX reversed

D.
Cross-talk