In ODBC, a file that can be shared among database users is called a:

Option A: system data source

This option is incorrect. A system data source is accessible by all users on a single computer and is not typically shared among multiple users across different computers.

Option B: file data source

This option is correct. A file data source (also known as a DSN file) is stored in a file and can be shared among multiple users and computers. It allows multiple users to access the same data source configuration.

Option C: user data source

This option is incorrect. A user data source is specific to a single user and is not intended to be shared among multiple users.

Option D: SQL text file

This option is incorrect. An SQL text file refers to a file containing SQL commands and is not a type of data source in ODBC.

Conclusion:

In ODBC, a file that can be shared among database users is called a file data source, making Option B: file data source the correct answer.