You can omit the parentheses if you code only the status subparameter.
If you omit the status subparameter but code subparameters for
normal or abnormal termination disposition, you must code a comma
to indicate the absence of NEW. For example, DISP=(,KEEP) or DISP=(,CATLG,DELETE).
If you omit the second subparameter but code the third, you must
code a comma to indicate the absence of the second subparameter.
For example, DISP=(OLD,,DELETE) or DISP=(,,KEEP).