Final answer:
The hierarchical and network data models lack both structural and data independence, unlike the relational model which supports both.
Step-by-step explanation:
The question pertains to database models and their ability to provide structural and data independence. Structural independence refers to the capacity to change the database structure without affecting the ability to access data. Data independence means that data can be manipulated without altering the structure of the database.
Among the various data models, the hierarchical and network models do not provide both structural and data independence. In contrast, the relational model does offer both types of independence. Both the hierarchical and network models are more rigid in their structure, so changes to the database schema can require considerable changes to the applications that access the database. Thus, they lack the flexibility associated with structural and data independence.