For cabinets (racks) arranged in rows, when their length exceeds (), additional channels should be added between two channels, and channels should be set up at both ends: when the distance between two channels exceeds (), channels should be added directly between the two channels.

For cabinets (racks) arranged in rows, when their length exceeds (), additional channels should be added between two channels, and channels should be set up at both ends: when the distance between two channels exceeds (), channels should be added directly between the two channels.
A . 6m, 15m
B . 6m, 20m
C . 8m, 15m
D . 8m, 20m

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Answer: A