Job Control Language (JCL) statements are Used to___________________?

A. Allocate the CPU to a job
B. Specify, to the operating system, the beginning and end of a job in a batch
C. Read the input from the slow-speed card reader to the high-speed magnetic disk
D. All of the above
✅ The correct answer is option B.

Which subsystem implements the requirements defined by the application ?

A. UI
B. DBMS
C. Application subsystem
D. None of the mentioned
✅ The correct answer is option C.
Explanation: This subsystem implements the requirements defined by the application within the context of the domain in which the application operates.