Final answer:
JCL enables processing of a batch job in a z/OS environment.
Step-by-step explanation:
The correct answer is JCL, which stands for Job Control Language. JCL is a scripting language used to define and control batch jobs in a z/OS environment. It specifies the programs, files, and resources needed to execute a particular job.
JCL statements are used to define the input and output files, identify program parameters, set up system resources, and specify execution conditions. It is essential for batch processing as it enables the scheduling, sequencing, and execution of jobs in a z/OS environment.