Which of the following is not included in the indoor survey of buildings?
A . Determine coverage
B . Determine building materials and thickness to estimate penetration loss
C . Understand the use of each floor and estimate the number of users on each floor
D . Examine the existing indoor distribution system design as a reference for the design of shared indoor distribution system
E . Determine available transmission, power and wiring resources, and installation space for antenna feeders, etc.
F . Measuring the altitude of the building
Answer: F