Final answer:
The correct response when a process issues an I/O request is that it is placed in an I/O queue, where it waits for the request to be serviced by the operating system.
Step-by-step explanation:
When the process issues an I/O request, the correct answer is: a) It is placed in an I/O queue. This happens because the process must wait for the I/O operation to complete, and during this time, it cannot proceed with execution. The operating system uses various queues to manage processes in different states.
Specifically, the I/O queue is used to manage all the processes that have issued I/O requests and are waiting for those requests to be serviced. In contrast, the waiting queue is generally for processes that are waiting for some event to occur, the ready queue is for processes that are ready to use the CPU, and the Job queue is for processes that are ready to be loaded into memory for execution but are not yet running.