Final answer:
The option that is NOT a type of database file is (e) 'Federal database'. This term does not refer to a database structure like the others; rather, it may refer to a database associated with a government entity.
Step-by-step explanation:
The question asks which option is NOT a type of database file. Among the listed options, hierarchical databases, relational databases, object databases, and multidimensional databases are all recognized types of database management systems that organize data in different ways for various use cases.
However, option (e) 'Federal database' is not a database type. Federal is often associated with a central or government-related context, not a type of database structure. Thus, 'Federal database' does not fit the category of database file types such as the others mentioned.