A technician working in the datacenter has finished racking a new 4U server into a new rack. Which
of the following should the technician do to allow for hot/cold aisle containment?

A.
Close the perforated floor tile in front of the new rack.

B.
Reset the rack temperature and humidity control.

C.
Install blanking panels in the rack.

D.
Lower the temperature of the data center HVAC.