A company has had problems with their HVAC system being able to cool their datacenter as they have grown. Which of the following could BEST be used to help reduce the load on the HVAC system?

Replacing CAT5 cables with CAT6 cables does not significantly reduce heat generated by network equipment or servers and therefore would not reduce the HVAC load.

Replacing traditional racks with water cooled racks directly removes heat from IT equipment using liquid cooling, which is significantly more efficient at heat transfer than air cooling, thereby reducing the thermal load on the facility's air-based HVAC system and improving cooling capacity.

Turning off non-critical application servers during non-business hours might slightly reduce heat, but it is a temporary and partial solution that doesn't address the primary cooling needs during operational hours or the heat from always-on infrastructure.

Taking out a second power supply in non-critical servers compromises redundancy and reliability without significantly reducing overall power consumption or heat output, as the remaining power supply would still draw the necessary power to operate the server.