To answer this question, you need to understand the purpose of the STEPLIB DD statement in JCL (Job Control Language).
Option A) Identify a library to be searched for programs named in the EXEC statement - This option is correct. The STEPLIB DD statement is used to specify a library or libraries that are to be searched for programs named in the EXEC statement. This allows the system to locate and execute the required program.
Option B) Identify a library containing executable job steps - This option is incorrect. The STEPLIB DD statement is not used to identify a library containing executable job steps. It is used specifically for programs named in the EXEC statement.
Option C) Override the system step library within a job stream - This option is incorrect. The STEPLIB DD statement does not override the system step library within a job stream. It is used to specify additional libraries to be searched for programs.
Option D) All of the above - This option is correct. The STEPLIB DD statement serves all the mentioned functions. It identifies a library to be searched for programs named in the EXEC statement, specifies additional libraries containing executable programs, and can override the system step library within a job stream.
The correct answer is D) All of the above. This option is correct because the STEPLIB DD statement can perform all the mentioned functions.