Final answer:
In retrofitting a building, the measures typically revolve around ensuring structural integrity, energy efficiency, and safety compliance. These categories are informed by building codes and research into sustainable living, targeting enhancements that support durability, reduce energy consumption, and protect inhabitants.
Step-by-step explanation:
The three basic categories of measures taken to retrofit a building are likely to involve structural adjustments, energy efficiency enhancements, and safety improvements. Though the provided options don't directly list these three as a group, we can derive from various building codes in More Developed Countries (MDCs) that the objectives of retrofitting often include ensuring structural integrity, providing necessary amenities such as running water and proper ventilation, as well as implementing energy-saving measures.
Structural measures might include reinforcing the building to better withstand earthquakes or upgrading materials to extend the life of the structure. Energy efficiency measures may involve installing better insulation, using high-efficiency heating and cooling systems, and optimizing the use of natural light. Finally, safety measures are crucial to comply with codes and might incorporate the installation of smoke detectors, proper electrical wiring, and adequate emergency exits.
While the question doesn't list exactly this set of categories, understanding the typical building codes and the growing research into environmentally friendly and zero-energy homes help us deduce what fundamental measures are usually taken during a retrofit.