Which of the following about indoor distribution connected is wrong?

Which of the following about indoor distribution connected is wrong?
A . the AP/power dividers/coupler/combiner/antenna joints are generally above N male head, general is mother N type head on both ends of the feeder and both of them are connected.
B . general situation room subsystem main or long (more than 50 meters) use 7/8 line transmission, use 1/2 feeder feeder or close transmission
C . 1/2 super soft feeder is very thin, flexible, commonly used to go small cracks in the diagram or transit bend Angle is bigger
D . the actual project to calculate the feeder, short feeder can be directly calculated standard number of feeder, long after the feeder need to confirm the wire path to reserve 10%~20% of the length of the feeder

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Answer: A