Certkiller .com wants to implement a Fibre Channel solution between two buildings that are 3 Km apart. Which of the following Fibre Channel cables should Certkiller .com use?

A.
Multimode cable.

B.
Single-mode cable

C.
Duplex cable

D.
Simplex cable

Explanation:
Single-mode cable is are for applications of over 550 meters. It has a greater transmission distance than multimode cable and is also more expensive.
Incorrect
Answers:
A: Multimode cable is the more common Fibre Channel cable and is used for short distance connections spanning over few meters.
C: Duplex cable allows for simultaneous, bidirectional data transfers. This allows devices to send and receive data simultaneously. They do not affect the distance of the cable. Furthermore, multimode duplex cable, as well as single-mode duplex cable is available.
D: Simplex cable consists of a single fiber that allows only one-way data transfers. Like duplex cable, they do not affect the distance of the cable and both multimode simplex cable, as well as single-mode simplex cable is available.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 204-205.