Multiple choice technology programming languages

Which one is the valid statement? 1 SYSIN DD DSN=DUMMY 2 SYSIN DD * 3 SYSIN DD DUMMY 4 SYSIN DD DSN=NULLFILE

  1. ALL THE ABOVE

  2. ONLY 1 AND 2

  3. ONLY 2 AND 4

  4. ONLY 2, 3 AND 4

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In JCL, SYSIN DD * is valid for instream data (2), SYSIN DD DUMMY creates a dummy dataset (3), and SYSIN DD DSN=NULLFILE points to a special null file (4). However, SYSIN DD DSN=DUMMY (1) is invalid because DSN= requires an actual dataset name, not DUMMY as a value. Therefore only statements 2, 3, and 4 are valid.

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