Hello there!
Your answer would be:
A file that is created with a text editor and contains only printable letters, numbers, and symbols.
A database may be exported to a text file. A text file is a file that is created with a text editor and contains only printable letters, numbers, and symbols
This would be the correct answer because the definition of a text file gets its definition from the name itself, "text" file. Meaning that in the file, it would just be pure text. The specific "texts" that are in the file are letters that are printable (e.g. letters of the English alphabet A-Z), numbers ( in which they are printable and more facile for the export), and symbols (e.g. things like #, %, etc.). When a database exports the file, it would be registered as a ".txt" file.