Multiple choice technology mainframe In COBOL , the File format : ORGANISATION IS SEQUENTIAL RECORDING MODE IS F BLOCK CONTAINS 0 . Is used to reference which file ? Fixed Block file Fixed Unblock file Variable Block file Variable Unblock file Reveal answer Fill a bubble to check yourself A Correct answer Explanation In COBOL, specifying BLOCK CONTAINS 0 records or characters tells the compiler that the blocking factor will be determined at runtime from the JCL (DCB parameters), which is standard practice for Fixed Blocked (FB) files.