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 r

ack.

B. Reset the rack temperature and humidity control.

C. Install blanking panels in the rack.

D. Lower the temperature of the data center HVAC.