Which two elements have a negative effect on the wireless users?

A wireless engineer is designing a wireless network for a warehouse using access points with internal antennas.

Which two elements have a negative effect on the wireless users? (Choose two.)
A . wireless channels
B . access point height
C . client authentication
D . client authorization
E . absorption

Answer: B,E

Explanation:

https://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1250-series/design_guide_c07-693245.html#_Toc309331086