What is concatenating?
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Overriding or adding procedures
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Logically connecting input datasets
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Overriding a called PROC dsname
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All of the above
Concatenation in JCL means logically connecting multiple input datasets so they are treated as a single sequential dataset. When datasets are concatenated, data is read from the first, then continues through the second, and so on. This is done via DD statements with multiple DSN parameters.
In JCL/COBOL batch processing, 'concatenating' refers to logically joining multiple input datasets together so they are read as a single continuous input stream (e.g., listing multiple DD statements under one DDNAME). It does not involve overriding procedures or PROC dataset names — those are separate JCL concepts (procedure overrides and DD name overrides for cataloged procedures), which is why those options are incorrect here.