Two new network switches located in different buildings are connected together with single-mode fiber.
However, no link exists between the two switches. Which of the following steps should the technician perform
FIRST to troubleshoot the issue?


A. Reverse TX/RX on the fiber patch cord at one building.
B. Replace the fiber patch cords in both buildings.
C. Clean the fiber patch cord connectors in both buildings.
D. Connect the fiber patch cord to an OTDR at one building.