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 has no meaningful impact on heat generation or cooling requirements - cable type does not affect server or rack thermal output.

Water cooled racks use liquid coolant circulated through rear-door heat exchangers or direct liquid cooling to absorb and remove heat produced by servers at the source, bypassing the need for the HVAC system to move large volumes of chilled air - this directly and substantially reduces the thermal load the HVAC must handle as the datacenter scales.

Turning off non-critical servers during non-business hours only provides temporary relief and does not address the underlying cooling capacity problem during peak operational hours.

Removing redundant power supplies reduces component count but the power savings are negligible and this approach sacrifices fault tolerance without meaningfully reducing overall datacenter heat output.