Final answer:
The correct JOB statement parameter is SYSOUT=. It is used in JCL on IBM mainframe operating systems to specify the output class for sysout datasets, which determines their routing post-job completion.
Step-by-step explanation:
The JOB statement is used in JCL (Job Control Language) on the IBM mainframe operating systems to define the start of a job and to provide parameters that describe how the entire job is to be processed. The JOB statement can include various parameters to control job processing; some of them are accounting information, job name, and execution parameters.
Looking at the options provided, the correct JOB statement parameter is SYSOUT=. This parameter is used to specify the output class for sysout datasets. The output class determines how and where the system's output, primarily logs, and printed reports, will be routed after the job has completed.
The other options given, such as PARM=, USER=, and UNIT=, are not JOB statement parameters. The PARM= parameter is used in the EXEC statement to pass parameters to a program. The USER= parameter is not a standard JCL parameter, and the UNIT= parameter is used in DD (Data Definition) statements to specify the type of device on which a dataset resides.