Final answer:
The characteristic of real property is the durability of improved land, as it denotes permanent structures or improvements that contribute to the property's long-term value.
Step-by-step explanation:
Among the listed options, the characteristic of real property is: (b) Durability of improved land. Real property refers to the land and any permanent structures or improvements attached to it. Items that are considered real property cannot be moved (as opposed to personal property, which is not fixed to the land), and they generally exhibit durability, particularly in the case of improved land where modifications or constructions have been added to enhance its value and utility. Durability is important because it contributes to the property's potential to endure over time and provide long-term value.