To answer this question, you need to understand the purpose of these values in JCL statements. Let's go through each option to understand why it is correct or incorrect:
Option A) Linkage variables - This option is incorrect because linkage variables are used in programming languages like COBOL to pass data between programs, not in JCL statements.
Option B) Parameters - This option is correct because JCL statements often contain specific values, known as parameters, that are used to direct and control the execution of the statement. These parameters can specify things like program names, dataset names, and other instructions for the system.
Option C) Control libraries - This option is incorrect because control libraries refer to datasets that contain control statements or programs used by the system during job execution, rather than specific values in JCL statements.
Option D) Includes - This option is incorrect because includes are used in programming languages like COBOL to include external code or copybooks, not in JCL statements.
The correct answer is B) Parameters. This option is correct because JCL statements often contain specific values, known as parameters, that are used to direct and control the execution of the statement.