Under which circumstances is a table considered to be a text table?

A table is designated as a text table when it serves to provide descriptions or text for the entries in another table, often known as a data table. This is typically achieved through a relationship established via a foreign key link between the two tables.

When considering the correct answer, having a foreign key to a data table signifies that the text table relates specifically to the data it describes. This relationship allows for the translation or representation of text values that correspond to the records in the related data table. Text tables commonly hold descriptions or titles that provide context for the data elements found in the associated data table.

In contrast, the other circumstances do not fully encapsulate the criteria required for a table to be classified as a text table. For instance, simply including the entire key of a data table as part of a text table's key does not alone denote a text table since it could describe any kind of relationship, not exclusively linked to textual descriptions.

An additional language key field may be beneficial for supporting multilingual content, but it is not essential for defining a text table. Meanwhile, limiting the table to just one character-based data field oversimplifies the requirements, as text tables can contain multiple fields, including descriptive texts and keys that relate back to the primary data table.