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A flat file database is designed to store data in a single table structure, which limits its complexity and the way data is interrelated. The characteristic that allows linking between multiple tables is typically associated with relational databases, where relationships can be established between different tables using foreign keys.

In a flat file database, data is often stored in a single file with records and fields, meaning that each piece of information is maintained within that one table without the relational capabilities found in more advanced database systems. This leads to simpler data storage and retrieval processes, as all data can be accessed from one file.

Other characteristics of a flat file database include the ability to handle varied data types within a single table and the straightforward retrieval of data directly from that table. These attributes affirm that the correct answer highlights a key distinction between flat file databases and more complex database management systems.