Final answer:
Reactive maintenance is the practice of making repairs after problems are reported by tenants, which can lead to higher costs and downtime compared to preventive maintenance strategies.
Step-by-step explanation:
Making repairs as tenants call into the office to report problems is known as b) Reactive maintenance. This type of maintenance strategy involves waiting for equipment to fail or for an issue to arise before taking action to address the problem. It is the opposite of proactive or preventive maintenance, which involves regular inspections and maintenance to prevent problems from occurring. Reactive maintenance can sometimes lead to higher costs and downtime since the approach is to deal with problems only after they have manifested. Businesses often strive for a balance between reactive, preventive, and routine maintenance to optimize their operations and maintenance costs.