Which is correct in the following statement on the location of the installation of AP? (Multiple choice)

Which is correct in the following statement on the location of the installation of AP? (Multiple choice)
A . For aesthetic needs, AP can give priority to be placed in the ceiling
B . If the site for the overall ceiling, AP should be considered to be placed in the vicinity of the maintenance service
C . Ceiling materials are generally very thin, the impact of coverage can be ignored
D . When the wall is installed or installed in the ceiling, it may be necessary to drill, the survey and the property as soon as possible to confirm whether feasible

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Answer: ABD