Final answer:
The subject of this question is Engineering, specifically related to building design and energy efficiency. The question is asking about ASHRAE 90.1 and its definition of baseline building performance as the annual energy cost for a building designed to minimum standards.
Step-by-step explanation:
The subject of this question is Engineering, specifically related to building design and energy efficiency. The question is referring to ASHRAE 90.1, which defines minimum design standards for buildings and establishes a baseline building performance based on those standards. The baseline building performance represents the annual energy cost for a building designed to meet those minimum standards.