Multiple choice technology mainframe

Modes to OPEN a file for writing :

  1. INPUT

  2. I-O, OUTPUT

  3. I-O, OUTPUT, EXTEND

  4. OUTPUT, EXTEND
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To open a file for writing in COBOL, you can use OUTPUT mode (creates new or truncates existing) or EXTEND mode (adds to end of existing file). INPUT (A) is for reading only. I-O (B) is for reading AND writing existing records, not pure writing. Option C incorrectly includes I-O.

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