A company needs a database in which data is stored in a variety of tables that can be joined together in logical ways.

Hierarchical databases organize data in a tree-like structure, where each record has a single parent and can have multiple children. This model is useful for representing relationships that follow a strict hierarchy, such as organizational charts, but it does not utilize plain text documents or delimiters for data storage.

Flat-file databases excel in storing data in a single, straightforward format, using delimiters such as commas to separate individual data fields. This simplicity allows for easy reading and writing of data in plain text files, making them ideal for applications that do not require the complexities of relational databases.

Cloud databases are hosted on remote servers and accessed via the internet, offering scalability and flexibility for data management. While they can support various database structures, they do not specifically focus on plain text document storage or delimiter-based organization, which is a hallmark of flat-file databases.