Which type of file structure is typically stored on magnetic tape?

The sequential access file structure is the correct choice in this case because it is designed for the efficient processing of large volumes of data that is typically stored in a linear fashion. When data is stored on magnetic tape, records are arranged end-to-end, and reading or writing data requires processing from the start of the tape to the target data point sequentially. This means that to access a particular record, the tape must be read from the beginning until the desired record is reached, which aligns perfectly with the way sequential access works.

In contrast, other file structures, such as random access, allow for direct access to any data point without needing to go through all previous data, making them unsuitable for tape-based storage. Similarly, methods like indexed sequential access involve an index to enable faster access to records, and relational file structures organize data in tables with relationships, which is not compatible with the characteristics of magnetic tape storage that favors sequential reading. Thus, the sequential access file structure is the most appropriate for data storage on magnetic tape.