Final answer:
The Initiator, part of JES2 or JES3, processes the JCL statements for each job, allocating resources and managing job flow in mainframe systems.
Step-by-step explanation:
The resource that processes the Job Control Language (JCL) statements for each job in a mainframe environment is known as an initiator. The initiator is a component of the Job Entry Subsystem (JES), specifically JES2 or JES3, depending on the system. It reads the JCL, allocates the necessary resources, initiates job execution, and manages job workflow.
While Spool is used for holding job output until it can be printed or dealt with, the Workload Manager (WLM) is involved in managing system resources and workload distribution. However, neither directly processes JCL statements.