What is one thing you should be aware of when conducting a wireless site survey？（）

• A、 5 GHz equipment will not be able to penetrate through walls as well as 2.4 GHZ equipment.
• B、 2.4 GHz equipment will not be able to penetrate through walls as well as 5 GHz equipment.
• C、 Mounting antennas near metal objects will slightly amplify the signal.
• D、 When determining coverage， you should begin measuring attenuation from the middle of the room.