Multiple choice technology mainframe U1006 Executing with modules compiled both with RES and NORES COBOL sort failed. Subscript out of range Program didn't close a file before ending Reveal answer Fill a bubble to check yourself C Correct answer Explanation The U1006 user abend code on IBM mainframe COBOL environments indicates that a subscript or index went out of range, typically detected when the program is compiled with the SSRANGE option.