The use of a central computer system to monitor a building's heating and cooling demands...

Comprehensive and Detailed Explanation From Exact Extract:

Central building automation systems (BAS) monitor and control HVAC and other systems to optimize energy efficiency by selecting the best combination of available systems and adjusting operation based on demand and conditions. This reduces energy consumption and operational costs.

BAS does not eliminate the need for facility managers (A), who oversee broader operations.

It aims to reduce, not increase, energy costs (C).

BAS is applicable to all mechanical systems, not limited to solar or natural cooling (D).