Multiple choice technology mainframe What is the parameter of REGION to be given to pick maximum space declared (A) REGION=0K OR 0M (B) REGION=OK or OM (C) REGION=0M (D) REGION=OM Reveal answer Fill a bubble to check yourself A Correct answer Explanation In IBM mainframe JCL, specifying REGION=0K or REGION=0M tells the system to allocate the maximum available region size for the job step. This allows the system to determine the optimal size rather than constraining it to a specific value.