Which of the following should be installed FIRST before rack mounting equipment?

A technician is helping set up a new networking closet and notices that the humidity level is low in
the room. Which of the following should be installed FIRST before rack mounting equipment?

A.
A dehumidifier

B.
A fire suppression system

C.
ESD strap

D.
Grounding bars

Explanation:

http://www.ecpowersystems.com/resources/electrical-power-systems/electrical-ground

bars-and-inefficient-data-centers/