单选题In order to link data centers, a customer is evaluating the installation of fiber optic cable between buildings that are 400 meters apart. The installation will require multiple patch panels and cables. Which of the following is the most critical factor to consider for this installation?（）AI/O rateBbandwidthCsignal lossDDense Wavelength Division Multiplexing (DWDM)
单选题
In order to link data centers, a customer is evaluating the installation of fiber optic cable between buildings that are 400 meters apart. The installation will require multiple patch panels and cables. Which of the following is the most critical factor to consider for this installation?（）
A
I/O rate
B
bandwidth
C
signal loss
D
Dense Wavelength Division Multiplexing (DWDM)
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